I've heard plenty of Christians try to answer the why question by going back to the what. "You have to believe because Jesus is the Son of God." But that's answering the why with more what. Increasingly we live in a time in which you can't avoid the why question. Just giving the what (for example, a vivid gospel presentation) worked in the days when the cultural institutions created an environment in which Christianity just felt true or at least honorable. But in a post-Christendom society, in the marketplace of ideas, you have to explain why this is true, or people will just dismiss it.
Timothy KellerMany people think of the Bible as a book of moral teachings with stories sprinkled through to illustrate the teachings. But it's a lot BETTER THAN THAT...the Bible is a single true story with teachings sprinkled through to illustrate the story.
Timothy KellerIf you wait until your motives are pure and unselfish before you do something, you will wait forever.
Timothy KellerThere are some needs only you can see. There are some hands only you can hold. There are some people only you can reach.
Timothy Keller