γένει προσήκειν

From LSJ

μισῶ σοφιστὴν ὅστις οὐχ αὑτῷ σοφός → I hate the sage who recks not his own rede, I hate the sage who is not wise for himself, I hate the wise man who is not wise on his own

Source

Greek > English (Woodhouse)

be related by blood