He had complied with her request
I have gladly acted as requested in your letter, having no doubt respecting those persons whom you proved to be men of worth. For I am sure that you bore testimony to them in the exercise of a godly judgment, and not through the influence of carnal favour. And your numerous quotations of Scripture passages exceedingly delighted me, which, when I had read, I had no longer a single doubtful thought respecting the matter. For I did not hold that those things were simply to be glanced over by my eyes, of which I had received from you such an incontrovertible demonstration. May I be in place of your soul, because you love Jesus, the Son of the living God. Wherefore also He Himself says to you, “I love them that love Me; and those that seek Me shall find peace.”
Source: The Spurious Epistles (New Advent)