Καὶ τῶν λεγόντων εὖ καλὸν τὸ μανθάνειν → It is a fine thing to learn from those who speak well
sos: arch. contr. form. 1 For eos; v. is init.— 2 For suos; v. suus init.
sōs, arch. pour suos et pour eos, v. suus et is.