" Ferry goes on to argue that almost all our possible answers to those big philosophical issues come from five or six major systems of thought. And today so many of the most common answers come from one system in particular. For example: Do you think it’s generally a good idea to be kind to your enemies and reach out to them rather than kill them? Ferry says this idea—that you should love your enemies—came from Christianity and nowhere else. And as we will see, there are plenty of other ideas we would consider valid, or noble, or even beautiful, that came solely from Christianity. Therefore, if you want to be sure that you are developing sound, thoughtful answers to the fundamental questions, you need at the very least to become acquainted with the teachings of Christianity. The "

― Timothy J. Keller , Encounters with Jesus: Unexpected Answers to Life's Biggest Questions