Mt 23:8-12

8^* As for you, do not be called ‘Rabbi.’ You have but one teacher, and you are all brothers. 9Call no one on earth your father; you have but one Father in heaven. 10Do not be called ‘Master’; you have but one master, the Messiah. 11^e The greatest among you must be your servant. 12^f Whoever exalts himself will be humbled; but whoever humbles himself will be exalted.