It 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 PiperGod's greatest interest is to glorify the wealth of His grace by making sinners happy in Him.
John PiperLove is doing what will enthrall the beloved with the greatest and longest joy. What will enthrall the beloved this way is the glory of God. Love means doing all we can, at whatever cost to ourselves, to help people be enthralled with the glory of God. When they are, they are satisfied and God is glorified. Therefore loving people and glorifying God are one.
John Piper