An Apology from Dr. Tim Keller
Dr. Keller makes a public apology! 1 Peter 3:15 tells us, "... but sanctify Christ as Lord in your hearts, always being ready to make a defense to everyone who asks you to give an account for the hope that is in you, yet with gentleness and reverence;"
The word "defense" here is the Greek word apologia, from which we get the English word "apology". Historically, the word apology refered to giving a reasoned defense of a position held.
I am fairly new to the ministry of Dr. Keller but became something of an instant admirer after watching his lecture at the Veritas Forum defending the Christian faith. I encourage you to watch it to sharpen your own skills in defending the faith. It is also something useful to point non-christian friends towards as a discussion starter. - John Samson