In Ephesians 5, Paul shows us that even on earth Jesus did not use his power to oppress us but sacrificed everything to bring us into union with him. And this takes us beyond the philosophical to the personal and the practical. If God had the gospel of Jesus's salvation in mind when he established marriage, then marriage only 'works' to the degree that approximates the pattern of God's self-giving love in Christ.

If there is a God, you owe him far more than a morally decent life.

Freedom is not the absence of limitations and constraints but it is finding the right ones, those that fit our nature and liberate us.

Christians need the gospel as much as non-Christians do.

The future is already won, and the more hostile the culture, the easier it is to communicate the difference of Christianity.

The purpose of Jesus's coming is to put the whole world right, to renew and restore the creation, not to escape it.

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.