John the Apostle
2 John 1:4BSB·traditional attribution

I was overjoyed to find some of your children walking in the truth, just as the Father has commanded us.

Matthew Henry Presbyterian @wholebiblehenry

Ancient epistles began, as here, with salutation and good wishes: religion consecrates, as far as may be, old forms, and turns compliments into real expressions of life and love. Here we have, as usually, I. The saluter, not expressed by name, but by a chosen character: The elder.

Commenting on 2 John 1:1-4

John Gill Reformed Baptist @doctorgill

I rejoiced greatly that I found of thy children,.... Not all, but some of them; for good parents have not always good children, or at least not all of them; Adam had a Cain, Abraham an Ishmael, and Isaac an Esau: God is pleased to show his discriminating grace in tribes and families, by taking some, and leaving others: it is a great mercy when...

Albert Barnes Presbyterian @notesbybarnes

Verse 4. I rejoiced greatly that I found, etc. That I learned this fact respecting some of thy children. The apostle does not say how he had learned this. It may have been that he had become personally acquainted with them when they were away from their home, or that he had learned it from others. The word used (ευρηκα) would apply to either method.