If you want to become great, you must be a servant just as I did not come to be served but to serve and to give my life as a ransom for many.  Matt 20:26,28

If you want to be first, you must be the very last.  Mark 9:35

Because the last will be first and the first will be last.  Many are called but few are chosen. 
Matt 20:16

If you exalt yourself, you will be humbled and if you humble yourself, you will be exalted. 
Matt 23:12

If you serve me, you must follow me and where I am you also will be.  My Father will honor you if you serve me. John 12:26

If you would come after me, you must deny yourself, take up your cross and follow me.  If you want to save your life, you will lose it but if you lose your life for me and the gospel, you will save it for eternity.  What good is it for you to gain the whole world yet forfeit your soul?  Or what can you give in exchange for your soul?  If you are ashamed of me and my words in this adulterous and sinful generation, then I will be ashamed of you when I return in my Father's glory with the holy angels...  Mark 8:34-38

…to reward each person for what they have done.  Matt 16:27

I am he who searches hearts and minds and I will repay you according to your deeds.  Rev 2:23

Whatever you do to someone else, you do to me as well.  And whatever you do not do for someone, you also do not do for me.  Matt 25:40,45