Matthew 23:8-12

8 But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.

9 And call no man your father upon the earth: for one is your Father, which is in heaven.

10 Neither be ye called masters: for one is your Master, even Christ.

11 But he that is greatest among you shall be your servant.

12 And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.