One God that worketh. Where we use the word powers the Greek term is energemata, a term which contains an allusion to the verb worketh, as in Latin effectus (an effect) corresponds with the verb effectus (to effect.) Paul's meaning is, that although believers may be endowed with different powers, they all take their rise from one and the same power on the part of God. Hence the expression employed here -- worketh all things in all -- does not refer to the general providence of God, but to the liberality that he exercises towards us, in bestowing upon every one some gift. The sum is this -- that there is nothing in mankind that is good or praiseworthy but what comes from God alone. Hence it is out of place here to agitate the question -- in what manner God acts in Satan and in reprobates.

Of operations - Of works; to wit, of miracles, such as God produces in the church, in the establishment and defense of his religion. There are different operations on the mind and heart; and different powers given to man, or different qualifications in building up and defending his cause. Or it may be, possibly, that Paul here refers to the works of God mainly for mere "illustration," and by the word "operations" means the works which God has performed in creation and providence. His works are various. They are not all alike, though they come from the same hand. The sun, the moon, the stars, the earth are different; the trees of the forest, the beasts of the field, the fowls of the air, the inhabitants of the deep are different; the flowers, and shrubs, and herbs are different from each other; yet. however much they may vary, they are formed by the same hand. are the productions of the same God, are to be regarded as proofs of the same wisdom and power. The same thing should be expected in his church; and we should anticipate that the endowments of its members would be various.
But it is the same God - The same Father; all these operations are produced by the same God. They should not, therefore, be undervalued or despised; nor should anyone be unduly elated, or pride himself on what has been conferred by God alone.
All in all - All these operations are to be traced to him. His agency is everywhere. It is as really seen in the insect's wing as in the limbs of the mammoth; as really in the humblest violet as in the loftiest oak of the forest. All, therefore, should regard themselves as under his direction, and should submit to his arrangements. If people regard their endowments as the gift of God, they will be thankful for them, and they will not be disposed to despise or undervalue others who have been placed in a more humble condition and rank in the church.

Diversities of operations - Ενεργηματων· Miraculous influences exerted on others; such as the expulsion of demons, inflicting extraordinary punishments, as in the case of Ananias and Sapphira, Elymas the sorcerer, etc., the healing of different diseases, raising the dead, etc.: all these proceeded from God the Father, as the fountain of all goodness and power, and the immediate dispenser of every good and perfect gift.
In the three preceding verses we find more than an indirect reference to the doctrine of the sacred Trinity.
Gifts are attributed to the Holy Spirit, 1-Corinthians 12:4.
Administrations to the Lord Jesus, 1-Corinthians 12:5.
Operations to God the Father, 1-Corinthians 12:6.
He who may think this fanciful must account for the very evident distinctions here in some more satisfactory way.

And there are diversities of (e) operations, but it is the same God which worketh all in all.
(e) So Paul calls that inward power which comes from the Holy Spirit, and makes men fit for wonderful things.

And there are diversities of operations, There are some that are ordinary, as the good work of grace, and the several parts of it, the work of faith, the labour of love, and patience of hope, which the Spirit of God begins, carries on, and finishes in all the elect of God, and members of Christ; and there are others which are extraordinary, and are here meant, and hereafter specified.
But it is the same God which worketh all in all. Interpreters in general understand by God here, God the Father; as by the Lord in the preceding verse, the Lord Jesus Christ, as distinct from the Spirit in 1-Corinthians 12:4 and apprehend that this furnishes out a considerable proof of a trinity of persons in the Godhead, which I will not deny; but I rather think that the Holy Ghost is designed in each verse, by Spirit, Lord, and God; since the various gifts, administrations, and operations, are particularly and peculiarly ascribed to him in the following verses; and the distribution of them is said to be the effect of his sovereign will; and so we have a most illustrious testimony of his proper deity and personality; who is the only true "Jehovah" with the Father and Son, to which the word "Lord" in the New Testament generally answers, and who is the omnipotent God, "which worketh all in all"; all the works of nature throughout the universe, and all the, works of grace in the hearts of all his people, and all the extraordinary operations effected by any of them.

operations--(Compare 1-Corinthians 12:10).
same God . . . worketh--by His Spirit working (1-Corinthians 12:11).
all in all--all of them (the "gifts") in all the persons (who possess them).

Operations - Effects produced. This word is of a larger extent than either of the former. But it is the same God who worketh all these effects in all the persons concerned.