"Do you realize what I have done for you?" You call me 'teacher' and 'master,' and rightly so, for indeed I am. If, therefore, the master and teacher, have washed your feet, you also ought to wash one another's feet. For I have given you an example, that you also should do as I have done to you. Truly, truly, I say to you, a servant is not greater than his master; nor is he who is sent greater than he who sent him. (John 13:12-16)