James Montgomery Boice, the late, great preacher, gave a series of 4 messages based on Romans 12: 1-2 at Believers Chapel in Dallas, Texas. This is fundamental teaching that we need to hear again and again because it goes against the grain of the culture. Boice discusses how we are to battle relativism, and looks intently at how we are to think in a Christian, Biblical way. The 4 messages are:
Mind Renewal in a Mindless World
Developing a Christian Mind 1
Developing a Christian Mind 2
Your Place in History
Faith by Hearing 