Truth and Morality: How can we know?

William Lane Craig and Shelly Kagan (Columbia)
Is God necessary for morality?
http://www.veritas.org/Media.aspx#/v/191

Peter Singer and John Hare (MIT)
"Moral Mammals - Why do we Matter? - Does theism or atheism provide the best foundation for human worth and morality?"
http://www.veritas.org/Media.aspx#/v/10

Dallas Willard (LSU)
The Value of Truth, and What Happens When U Don't Have It
http://veritas.org/Media.aspx#/v/258