39 But I say, don't resist an evil person! If you are slapped on the right cheek, turn the other, too. 40 If you are ordered to court and your shirt is taken from you, give your coat, too. 41 If a soldier demands that you carry his gear for a mile,[m] carry it two miles. 42 Give to those who ask, and don't turn away from those who want to borrow.

This is Jesus teaching the people about 'Revenge'. When Jesus said "If you are slapped on the right cheek, turn the other, too." It means when you get slapped the first time, it means that the person that slapped you is better then you (of a higher ranking), but when you turn your other cheek it is telling him, No we are equal you are no better than me.

In verse 41 Jesus said "If a soldier demands that you carry his gear for a mile, carry it two miles." This means when he asks you to carry his gear the first mile you are made to do it for him, (as a slave, doign everything he asks) but if you were to do it for two miles you could say to him, No I did it for you.(out of willing heart, or revenge)