"Think not that I have come to bring peace on earth: I came not to bring peace, but the sword."
How did I know you were going to pull this quote up? Do you think it negates "turn the other cheek" or just contradicts it?
You have heard that it was said, 'An eye for an eye, and a tooth for a tooth.' But I tell you, do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also. And if someone wants to sue you and take your tunic, let him have your cloak as well. If someone forces you to go one mile, go with him two miles. Give to the one who asks you, and do not turn away from the one who wants to borrow from you.
ŚMatthew 5:38-42, NIV