There is a warning. The path of God-exalting joy will cost you your life. Jesus said, ‘Whoever loses his life for my sake and the gospel’s will save it.’ In other words, it is better to lose your life than to waste it. If you live gladly to make others glad in God, your life will be hard, your risks will be high, and your joy will be full. This is not a book about how to avoid a wounded life, but how to avoid a wasted life. Some of you will die in the service of Christ. That will not be a tragedy. Treasuring life above Christ is a tragedy.
— John Piper