Your boasting is not good. Do you not know that a little leaven works through the whole batch of dough?
Οὐ καλὸν τὸ καύχημα ὑμῶν. Οὐκ οἴδατε ὅτι μικρὰ ζύμη ὅλον τὸ φύραμα ζυμοῖ;