Battlestar Galactica, Season 3

Cain:
Sometimes, we have to leave people behind, so that we can go o­n. So that we can continue to fight. Sometimes, we have to do things that we never thought we were capable of, if o­nly to show the enemy our will. Yesterday, you showed me that you were capable of setting aside your fear, setting aside your hesitation, and even your revulsion -- every natural inhibition that during battle can mean the difference between life and death. When you can be this for as long as you have to be, then you're a razor. This war is forcing us all to become razors because if we don't, we don't survive. And then we don't have the luxury of becoming simply human again.