Here is a link to the sermon he preached at One Day 2000 that helped him write his book Don't Waste Your Life
Bosting Only in the Cross
Acts 20:24: "I do not account my life of any value nor as precious to myself, if only I may accomplish my course and the ministry which I received from the Lord Jesus, to testify to the gospel of the grace of God."
One thing mattered: Finish my course, run my race.
Philippians 3:7-8: "But whatever gain I had, I counted as loss for the sake of Christ. Indeed I count everything as loss because of the surpassing worth of knowing Christ Jesus my Lord. For his sake I have suffered the loss of all things, and count them as refuse, in order that I may gain Christ."