But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?

but now that ye have come to know God, or rather to be known by God, how turn ye back again to the weak and beggarly rudiments, whereunto ye desire to be in bondage over again?

But now, after that you have known God, or rather are known by God: how turn you again to the weak and needy elements, which you desire to serve again?

but now, knowing God, but rather being known by God, how do ye turn again to the weak and beggarly principles to which ye desire to be again anew in bondage?

But now, after ye have known God, or rather are known by God, how turn ye again to the weak and beggarly elements, to which ye desire again to be in bondage?

and now, having known God, and rather being known by God, how turn ye again unto the weak and poor elements to which anew ye desire to be in servitude?

Now, however, having come to know God - or rather to be known by Him - how is it you are again turning back to weak and worthless rudimentary notions to which you are once more willing to be enslaved?

But now that you have come to have knowledge of God, or more truly, God has knowledge of you, how is it that you go back again to the poor and feeble first things, desiring to be servants to them again?

But now, since you have known God, or rather, since you have been known by God: how can you turn away again, to weak and destitute influences, which you desire to serve anew?

But now that you have found God – or, rather, have been found by him – how is it that you are turning back to that poor and feeble puerile teaching, to which yet once again you are wanting to become slaves?

Nunc autem postquam cognovistis Deum, vel potius cogniti fuistis a Deo; quomode convertimini rursus ad infirma et egena elementa, quibus rursus Deuteronomy integro servire vultis?

But now, [1] after that ye have known God. No language can express the base ingratitude of departing from God, when he has once been known. What is it but to forsake, of our own accord, the light, the life, the fountain of all benefits, -- "to forsake," as Jeremiah complains, "the fountain of living waters, and hew out cisterns, broken cisterns, that can hold no water!" (Jeremiah 2:13.) Still farther to heighten the blame, he corrects his language, and says, or rather have been, known by God; for the greater the grace of God is towards us, our guilt in despising it must be the heavier. Paul reminds the Galatians whence they had derived the knowledge of God. He affirms that they did not obtain it by their own exertions, by the acuteness or industry of their own minds, but because, when they were at the farthest possible remove from thinking of him, God visited them in his mercy. What is said of the Galatians may be extended to all; for in all are fulfilled the words of Isaiah, "I am sought by them that asked not for me: I am found by them that sought me not." (Isaiah 65:1.) The origin of our calling is the free election of God, which predestinates us to life before we are born. On this depends our calling, our faith, our whole salvation. How turn ye again? They could not turn again to ceremonies which they had never practiced. The expression is figurative, and merely denotes, that to fall again into wicked superstition, as if they had never received the truth of God, was the height of folly. When he calls the ceremonies beggarly elements, he views them as out of Christ, and, what is more, as opposed to Christ. To the fathers they were not only profitable exercises and aids to piety, but efficacious means of grace. But then their whole value lay in Christ, and in the appointment of God. The false apostles, on the other hand, neglecting the promises, endeavored to oppose the ceremonies to Christ, as if Christ alone were not sufficient. That they should be regarded by Paul as worthless trifles, cannot excite surprise; but of this I have already spoken. The word bondage conveys a reproof for submitting to be slaves. [2]

Footnotes

1 - Mallon de "The Greek writers make use of these two particles for the purpose of correcting what they have already said, and, as if it had not been enough, of adding something more. Thus, Romans 8:34, and in Polybius. Chresimon eie mallon d ' aenankaion. "It would be useful, it would even be necessary." Kai gar atopon mallon d ' hos eipein adunaton, adunaton. "It would be absurd; it would even be impossible." -- Raphelius.

2 - "Par ce mot de Servir, il reprend la necessity, a laquelle ils s'astraignoyent d'observer les ceremonies." "By the word bondage,' he reproves them for the necessity to which they had reduced themselves to observe ceremonies."

But now - The sense is, that since they had been made free from their ignoble servitude in the worship of false gods, and had been admitted to the freedom found in the worship of the true God, it was absurd that they should return again to that which was truly slavery or bondage, the observance of the rites of the Jewish law.
That ye have known God - The true God, and the ease and freedom of his service in the gospel.
Or rather are known of God - The sense is, "Or, to speak more accurately or precisely, are known by God." The object of this correction is to avoid the impression which might be derived from the former phrase that their acquaintance with God was owing to themselves. He therefore states, that it was rather that they were known of God; that it was all owing to him that they had been brought to an acquaintance with himself. Perhaps, also, he means to bring into view the idea that it was a favor and privilege to be known by God, and that therefore it was the more absurd to turn back to the weak and beggarly elements.
How turn ye again - Margin, "Back." "How is it that you are returning to such a bondage?" The question implies surprise and indignation that they should do it.
To the weak and beggarly elements - To the rites and ceremonies of the Jewish law, imposing a servitude really not less severe than the customs of paganism. On the word elements, see the note at Galatians 4:3. They are called "weak" because they had no power to save the soul; no power to justify the sinner before God. They are called "beggarly" (Greek πτωχὰ ptōcha, poor), because they could not impart spiritual riches. They really could confer few benefits on man. Or it may be, as Locke supposes, because the Law kept people in the poor estate of pupils from the full enjoyment of the inheritance; Galatians 4:1-3.
Whereunto ye desire again to be in bondage - As if you had a wish to be under servitude. The absurdity is as great as it would be for a man who had been freed from slavery to desire his chains again. They had been freed by the gospel from the galling servitude of paganism, and they now again had sunk into the Jewish observances, as if they preferred slavery to freedom, and were willing to go from one form of it to another. The main idea is, that it is absurd for people who have been made free by the gospel to go back again into any kind of servitude or bondage. We may apply it to Christians now. Many sink into a kind of servitude not less galling than was that to sin before their conversion. Some become the slaves of mere ceremonies and forms in religion. Some are slaves to fashion, and the world still rules them with the hand of a tyrant. They have escaped, it may be, from the galling chains of ambition, and degrading vice, and low sensuality; but they became slaves to the love of money, or of dress, or of the fashions of the world, as if they loved slavery and chains; and they seem no more able to break loose than the slave is to break the bonds which bind him. And some are slaves to some expensive and foolish habit. Professed Christians, and Christian ministers too, become slaves to the disgusting and loathsome habit of using tobacco, bound by a servitude as galling and as firm as that which ever shackled the limbs of an African. I grieve to add also that many professed Christians are slaves to the habit of "sitting long at the wine" and indulging in it freely. O that such knew the liberty of Christian freedom, and would break away from all such shackles, and show how the gospel frees people from all foolish and absurd customs!

Now, after that ye have known God - After having been brought to the knowledge of God as your Savior.
Or rather are known of God - Are approved of him, having received the adoption of sons.
To the weak and beggarly elements - After receiving all this, will ye turn again to the ineffectual rites and ceremonies of the Mosaic law - rites too weak to counteract your sinful habits, and too poor to purchase pardon and eternal life for you? If the Galatians were turning again to them, it is evident that they had been once addicted to them. And this they might have been, allowing that they had become converts from heathenism to Judaism, and from Judaism to Christianity. This makes the sense consistent between the 8th and 9th verses.

But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and (k) beggarly elements, whereunto ye desire (l) again to be in bondage?
(k) They are called impotent and beggarly ceremonies, being considered apart by themselves without Christ: and again, by that means they gave good testimony that they were beggars in Christ, for when men fall back from Christ to ceremonies, it is nothing else but to cast away riches and to follow beggary.
(l) By going backward.

But now, after that ye have known God, God in Christ, as their covenant God and Father, through the preaching of the Gospel, and in the light of divine grace; God having caused light to shine in their dark hearts; and having given them the light of the knowledge of himself in the face of Christ, and having sent down into their hearts the Spirit of his Son, crying "Abba", Father.
Or rather are known of God; for it is but little that the best of these, that have the greatest share of knowledge, know of him; and what knowledge they have, they have it first, originally, and wholly from him: that knowledge which he has of them is particular, distinct, and complete; and is to be understood, not of his omniscience in general, so all men are known by him; but of his special knowledge, joined with affection, approbation, and care: and the meaning is, that they were loved by him with an everlasting love, which had been manifested in their conversion, in the drawing of them to himself, and to his Son; that he approved of them, delighted in them, had an exact knowledge, and took special care of them: but, oh, folly and ingratitude!
how turn ye again to the weak and beggarly elements, whereunto you desire again to be in bondage? meaning the ordinances of the ceremonial law, he before calls "the elements of the world", and here "weak", because they could not give life, righteousness, peace, joy, comfort, and salvation; and, since the coming of Christ, were become impotent to all the uses they before served; and beggarly, because they lay in the observation of mean things, as meats, drinks, &c. and which were only shadows of those good things, the riches of grace and glory, which come by Christ. The Galatians are said to turn again to these; not that they were before in the observation of them, except the Jews, but because there was some likeness between these, and the ceremonies with which they carried on the service of their idols; and by showing an inclination to them, they discovered a good will to come into a like state of bondage they were in before; than which nothing could be more stupid and ungrateful in a people that had been blessed with so much grace, and with such clear Gospel light and knowledge.

known God or rather are known of God--They did not first know and love God, but God first, in His electing love, knew and loved them as His, and therefore attracted them to the saving knowledge of Him (Matthew 7:23; 1-Corinthians 8:3; 2-Timothy 2:19; compare Exodus 33:12, Exodus 33:17; John 15:16; Philippians 3:12). God's great grace in this made their fall from it the more heinous.
how--expressing indignant wonder at such a thing being possible, and even actually occurring (Galatians 1:6). "How is it that ye turn back again?"
weak--powerless to justify: in contrast to the justifying power of faith (Galatians 3:24; compare Hebrews 7:18).
beggarly--contrasted with the riches of the inheritance of believers in Christ (Ephesians 1:18). The state of the "child" (Galatians 4:1) is weak, as not having attained manhood; "beggarly," as not having attained the inheritance.
elements--"rudiments." It is as if a schoolmaster should go back to learning the A, B, C'S [BENGEL].
again--There are two Greek words in the original. "Ye desire again, beginning afresh, to be in bondage." Though the Galatians, as Gentiles, had never been under the Mosaic yoke, yet they had been under "the elements of the world" (Galatians 4:3): the common designation for the Jewish and Gentile systems alike, in contrast to the Gospel (however superior the Jewish was to the Gentile). Both systems consisted in outward worship and cleaved to sensible forms. Both were in bondage to the elements of sense, as though these could give the justification and sanctification which the inner and spiritual power of God alone could bestow.
ye desire--or "will." Will-worship is not acceptable to God (Colossians 2:18, Colossians 2:23).

But now being known of God - As his beloved children. How turn ye back to the weak and poor elements - Weak, utterly unable to purge your conscience from guilt, or to give that filial confidence in God. Poor - incapable of enriching the soul with such holiness and happiness as ye are heirs to. Ye desire to be again in bondage - Though of another kind; now to these elements, as before to those idols.