I have no greater joy than this, etc. That is, that I recognize those whom I have begotten to God by preaching or baptizing, observing the truth both of right faith and good operation.
I have no greater joy than to hear that my children are walking in the truth.
"no greater joy than." The term "greater" (µειζοτέραν) according to the practice of the Greek language is not a suitable comparative expression, but it is placed as if seeking a more fervent exaggeration, and thus the comparative is formed from the comparative.
[AD 735] Bede on 3 John 1:4