Luke 6:29-30, 32-34

Whoever strikes you on the cheek, offer him the other one also [simply ignore insignificant insults or losses and do not bother to retaliate—maintain your dignity]. Whoever takes away your coat, do not withhold your shirt from him either. [Matt 5:39-42] Give to everyone who asks of you. Whoever takes away what is yours, do not demand it back.

If you [only] love those who love you, what credit is that to you? For even sinners love those who love them. If you do good to those who do good to you, what credit is that to you? For even sinners do the same. If you lend [money] to those from whom you expect to receive [it back], what credit is that to you? Even sinners lend to sinners expecting to receive back the same amount.