Matthew 23:7-12

and to be greeted [with respect]in the market places and public forums, and to have people call them Rabbi. But do not be called Rabbi (Teacher); for One is your Teacher, and you are all [equally] brothers. Do not call anyone on earth [who guides you spiritually] your father; for One is your Father, He who is in heaven. Do not let yourselves be called leaders or teachers; for One is your Leader (Teacher), the Christ. But the greatest among you will be your servant. Whoever exalts himself shall be humbled; and whoever humbles himself shall be raised to honor.