That ye may walk worthy of God. In the first place he teaches, what is the end of spiritual understanding, and for what purpose we ought to make proficiency in God's school -- that we may walk worthy of God, that is, that it may be manifest in our life, that we have not in vain been taught by God. Whoever they may be that do not direct their endeavors towards this object, may possibly toil and labor much, but they do nothing better than wander about in endless windings, without making any progress. [1] Farther, he admonishes us, that if we would walk worthy of God, we must above all things take heed that we regulate our whole course of life according to the will of God, renouncing our own understanding, and bidding farewell to all the inclinations of our flesh. This also he again confirms by saying -- unto all obedience, or, as they commonly say, well-pleasing. Hence if it is asked, what kind of life is worthy of God, let us always keep in view this definition of Paul -- that it is such a life as, leaving the opinions of men, and leaving, in short, all carnal inclination, is regulated so as to be in subjection to God alone. From this follow good works, which are the fruits that God requires from us. Increasing, in the knowledge of God. He again repeats, that they have not arrived at such perfection as not to stand in need of farther increase; by which admonition he prepares them, and as it were leads them by the hand, to an eagerness for proficiency, that they may shew themselves ready to listen, and teachable. What is here said to the Colossians, let all believers take as said to themselves, and draw from this a common exhortation that we must always make progress in the doctrine of piety until death.

Footnotes

1 - "Mais ils ne feront que tracasser çà et là, et tourner a l'entour du pot (comme on dit) sans s'auancer;" -- "But they will do nothing else than hurry hither and thither, and go about the bush (as they say) without making progress."

That ye might walk worthy of the Lord - That you may live as becomes the followers of the Lord. How this was to be done he states in this and the following verses.
Unto all pleasing - So as to please him in all things; compare Hebrews 11:5.
Being fruitful in every good work - This is one way in which we are to walk worthy of the Lord, and so as to please him; see the notes at John 15:8.
And increasing in the knowledge of God - This is another way in which we may walk worthy of the Lord, and so as to please him. It is by endeavoring to become better acquainted with his true character. God is pleased with those who desire to understand what he is; what he does; what he purposes; what he commands. Hence he not only commands us to study his works (compare Psalm 111:2), but he has made a world so beautiful as to invite us to contemplate his perfections as reflected in that world. All good beings desire that others should understand their character, and God delights in those who are sincerely desirous of knowing what he is, and who inquire with humility and reverence into his counsels and his will. People are often displeased when others attempt to look into their plans, for they are sensible they will not bear the light of investigation. God has no plans which would not be seen to be, in the highest degree, glorious to him.

That ye might walk worthy of the Lord - Suitably to your Christian profession, exemplifying its holy doctrines by a holy and useful life. See the notes on Ephesians 4:1; and on Philippians 1:27 (note).
Unto all pleasing - Doing every thing in the best manner, in the most proper time, and in a becoming spirit. Even a good work may be marred and rendered fruitless by being done improperly, out of season, or in a temper of mind that grieves the Holy Spirit.
Being fruitful in every good work - See on Colossians 1:6 (note). St. Paul exhorts the Christians at Colosse,
1. To walk - to be active in their Christian calling.
2. To walk worthily - suitably to the dignity of that calling, and to the purity of that God who had called them into this state of salvation.
3. To do every thing unto all pleasing; that God might be pleased with the manner, the time, the motive, disposition, design, and object of every act.
4. That they should be fruitful; mere harmlessness would not be sufficient; as God had sown good seed, he expected good fruit.
5. That every work should be good; they must not be fruitful in some works and fruitless in others.
6. That they should increase in religious knowledge as time rolled on, knowing, by genuine Christian experience, more of God, of his love, and of his peace, day by day.

That ye might walk worthy of the Lord,.... The Vulgate Latin version reads, "of God"; to which the Ethiopic version agrees; but rather the Lord Jesus Christ seems to be designed: and to "walk worthy" of him, is to walk by faith in him; to walk after his Spirit, and according to his word, and in his ordinances; to have the conversation as becomes his Gospel, and worthy of that calling wherewith the saints are called by grace to the obtaining of his kingdom and glory. The apostle prays that their knowledge might issue in practice; for knowledge, without practice, is of no avail: he first asks for knowledge, and then practice, for how should men act according to the will of God, or Christ, unless they know it? and when they know it, they should not rest in their knowledge, but put it in practice:
unto all pleasing. The Syriac reads it, "that ye may please God in all good works": an unregenerate man cannot please God in anything; without faith in Christ it is impossible to please him by anything man can do; Christ only could, and did always the things that pleased his Father; there are many things done by believers which are displeasing to God; nor is there anything they can do that is pleasing to God but through Christ, in whom their persons and, services are accepted; good works being done in faith, and from a principle of love, and with a view to the glory of God, are acceptable unto him through Christ; and therefore are to be carefully maintained, and studiously performed by all those that have a spiritual understanding of the will of God, and believe in Christ their Lord and Redeemer:
being fruitful in every good work; saints are trees of righteousness, the planting of the Lord; good works are the fruit, which, under the influence of divine grace, they bring forth; and this is not of one sort only, as trees usually do, but of every kind; being ingrafted into Christ the true vine, and deriving life, sap, and nourishment from him, they are filled with the fruits of righteousness by him, which they bring forth and bear, to the glory of his heavenly Father; and being such, they are pleasant plants to him, as fruit bearing trees are to the owner of them: wherefore, in order to the saints walking in their lives and conversations unto all pleasing, or pleasing in all things, the apostle prays they might be fruitful in good works, and that in everyone, in every kind of good works:
and increasing in the knowledge of God; not barely of his nature and perfections, as they are displayed in the works of creation; but of his mind, and will, and the mysteries of his grace, as they are revealed in the Gospel; of the knowledge of him in Christ, as the God of all grace, and as a covenant God and Father. The apostle had before prayed for an increase of the knowledge of the will of God, previous to his request, for the putting of it in practice; and now suggests, that an increase of the knowledge of God himself may be expected in a practical use of means, an attendance on the ordinances of Christ, and a diligent performance of good works: from the whole of these petitions, it may be observed by the apostle's asking for them, that all our knowledge, and the increase of it, and all our fruitfulness in good works, are all from the Lord; and therefore we have no reason to boast of our knowledge, nor depend upon our works, but frankly to own, that notwithstanding all we know, and do, we are but unprofitable servants.

Greek, "So as to walk"; so that ye may walk. True knowledge of God's will is inseparable from walking conformably to it.
worthy of the Lord-- (Ephesians 4:1).
unto--so as in every way to be well-pleasing to God.
pleasing--literally, "desire of pleasing."
being fruitful--Greek, "bearing fruit." This is the first manifestation of their "walking worthy of the Lord." The second is, "increasing (growing) in the knowledge of God (or as the oldest manuscripts read, 'growing BY the full knowledge of God')"; thus, as the Gospel word (Colossians 1:6) was said to "bring forth fruit," and to "grow" in all the world, even as it did in the Colossians, ever since the day they knew the grace of God, so here it is Paul's prayer that they might continue to "bring forth fruit," and "grow" more and more by the full knowledge of God, the more that "knowledge" (Colossians 1:9) was imparted to them. The full knowledge of God is the real instrument of enlargement in soul and life of the believer [ALFORD]. The third manifestation of their walk is (Colossians 1:11), "Being strengthened with all might," &c. The fourth is (Colossians 1:12), "Giving thanks unto the Father," &c.

That, knowing his whole will, ye may walk worthy of the Lord, unto all pleasing - So as actually to please him in all things; daily increasing in the living, experimental knowledge of God, our Father, Saviour, Sanctifier.