That I may become a partaker of it. As the Corinthians might think with themselves, that this was a peculiarity in Paul's case on the ground of his office, he argues, from the very design of it, that this is common to all Christians. For when he declares, that his aim had been, that he might become a partaker of the gospel, he indirectly intimates, that all who do not act the same part with him are unworthy of the fellowship of the gospel. To become a partaker of the gospel is to receive the fruit of it.

For the gospel's sake - That it may be advanced, and may be successful.
That I might be partaker thereof with you - You hope to be saved. You regard yourselves as Christians; and I wish to give evidence also that "I" am a Christian, and that I shall be admitted to heaven to partake of the happiness of the redeemed. This he did, by so denying himself as to give evidence that he was truly actuated by Christian principles.

And this I do for the Gospel's sake - Instead of τουτο, this, παντα, all things, (I do all things for the Gospel's sake), is the reading of ABCDEFG, several others, the Coptic, Ethiopic, Vulgate, Itala, Armenian, and Sahidic; the two latter reading ταυτα παντα, all these things.
Several of the fathers have the same reading, and there is much reason to believe it to be genuine.
That I might be partaker thereof with you - That I might attain to the reward of eternal life which it sets before me; and this is in all probability the meaning of το ευαγγελιον, which we translate the Gospel, and which should be rendered here prize or reward; this is a frequent meaning of the original word, as may be seen in my preface to St. Matthew: I do all this for the sake of the prize, that I may partake of it with you.

And this I do for the gospel's sake, that I might be partaker thereof with (r) [you].
(r) That both I and those to whom I preach the Gospel, may receive fruit by the Gospel.

And this I do for the Gospel's sake,.... The Alexandrian copy and some others read, "all things I do", &c. and so the Vulgate Latin and Ethiopic versions; that is, he became all things to all men, and so and so to different persons; not for his own sake, for his own temporal advantage, or to curry favour with men; not for the sake of gaining wealth, or honour and applause to himself, but for the spread of the Gospel, and its greater usefulness among men: to which he adds,
that I might be partaker thereof with you; meaning either the fruit of the Gospel, the conversion and salvation of sinners, which would be matter of joy both to him and them; or the blessings of grace and eternal life, which the Gospel reveals and promises, which he desired to enjoy in common with others, not only with the Corinthians, for the word "you" is not in the original text, but with Jews and Gentiles; with men of all sorts, who may be gained over to Christ, and saved by him, through the ministry of the word.

partaker thereof--Greek, "fellow partaker": of the Gospel blessings promised at Christ's coming: "with" (not as English Version, "you": but) them, namely, with those thus "gained" by me to the Gospel.