~ Matthew 5:38-42
38"You have heard that it was said, 'Eye for eye, and tooth for tooth.' 39But I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also. 40And if someone wants to sue you and take your tunic, let him have your cloak as well. 41If someone forces you to go one mile, go with him two miles. 42Give to the one who asks you, and do not turn away from the one who wants to borrow from you.
New International Version
Why would someone be shocked if you granted generosity instead of revenge? Who needs you to turn the other cheek or walk an extra mile?