15:10a But by the grace of God I am what I am,

But God in his grace/kindness made me ⌊an apostle⌋
-or-
But because God was kind to me I have this work to do.

15:10b and His grace to me was not in vain.

and his grace/kindness to me was not useless/wasted.
-or-
He was gracious/kind to me, and it had good results.

15:10c No, I worked harder than all of them—

For I worked harder than any of the other apostles.
-or-
The result was, I worked harder ⌊at preaching the gospel⌋ than all the other apostles.

15:10d yet not I, but the grace of God that was with me.

But it was not really I who was working, but God, who in his kindness was with me.
-or-
But it was not actually I who was working. It was God, who was being kind/gracious to me.

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