"But I tell you: Love your enemies and pray for those who persecute you. [...] If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your brothers, what are you doing more than others? Do not even pagans do that?

Matthew 5:44,46-47

Every time terrorism comes out, I always think of this passage of the Bible. Whatever religion you profess (or even if you don't), loving people that love you is easy, anyone can do it. Loving those who hate you... that's what makes you greater.