There is a warning. The path of God-exalting joy will cost you your life. Jesus said, โWhoever loses his life for my sake and the gospelโs will save it.โ 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 PiperIt is evil to justify killing (unborn babies) by the happy outcome of eternity for the one killed. This same justification could be used to justify killing one-year olds, or any heaven-bound believer for that matter. The Bible asks the question: "Shall we sin that grace may abound?" (Romans 6:1) And: "Shall we do evil that good may come?" (Romans 3:8). In both cases the answer is a resounding NO. It is presumption to step into God's place and try to make the assignments to heaven or to hell. Our duty is to obey God, not to play God.
John Piper