Matthew 23:8-12

8But ye, be not ye called Rabbi; for one is your instructor, and all ye are brethren.

9And call not [any one] your father upon the earth; for one is your Father, he who is in the heavens.

10Neither be called instructors, for one is your instructor, the Christ.

11But the greatest of you shall be your servant.

12And whoever shall exalt himself shall be humbled, and whoever shall humble himself shall be exalted.