Matthew 7:2

ἐν ᾧ γὰρ, etc.: Vulgatissimum hoc apud Judaeos adagium, says Lightfoot (Hor. Heb.). Of course; one would expect such maxims, based on experience, to be current among all peoples (vide Grotius for examples). It is the lex talionis in a new form: character for character. Jesus may have learned some of these moral adages at school in Nazareth, as we have all when boys learned many good things out of our lesson books with their collections of extracts. The point to notice is what the mind of Jesus assimilated the best in the wisdom of His people and the emphasis with which He inculcated the best, so as to ensure for it permanent lodgment in the minds of His disciples and in their records of His teaching.