Warnings of Jesus:
Whoever exalts himself will be humbled!

But you are not to be called ‘Rabbi,’ for you have one Teacher, and you are all brothers. And do not call anyone on earth your father, for you have one Father, who is in heaven. Nor are you to be called instructors, for you have one Instructor, the Christ. The greatest among you shall be your servant. For whoever exalts himself will be humbled, and whoever humbles himself will be exalted. Matthew 23:8-12

But Jesus called them aside and said, “You know that the rulers of the Gentiles lord it over them, and their superiors exercise authority over them. It shall not be this way among you. Instead, whoever wants to become great among you must be your servant,and whoever wants to be first among you must be your slave, just as the Son of Man did not come to be served, but to serve, and to give His life as a ransom for many.” Matthew 20:25-28

You call Me Teacher and Lord, and rightly so, because I am. So if I, your Lord and Teacher, have washed your feet, you also should wash one another’s feet. I have set you an example so that you should do as I have done for you. Truly, truly, I tell you, no servant is greater than his master, nor is a messenger greater than the one who sent him. If you know these things, you will be blessed if you do them. John 13:13-17