You don’t have to know a lot of things for your life to make a lasting difference in the world. But you do have to know the few great things that matter, perhaps just one, and then be willing to live for them and die for them. The people that make a durable difference in the world are not the people who have mastered many things, but who have been mastered by one great thing.
John PiperSo saving grace, converting grace, for Augustine, is God's giving us a sovereign joy in God that triumphs over all other joys and therefore sways the will. The will is free to move toward whatever it delights in most fully, but it is not within the power of our will to determine what that sovereign joy will be.
John PiperHow do you get from, "We do not know whether this is protectable human life," to "Therefore, we will not protect it?" Wouldn't the logic just as likely (some would say far more likely) be, "Since we do not know whether this is protectable human life, therefore we will protect it?" Why does the judicial uncertainty about the humanity of the unborn lead to unbridled license to destroy it?
John Piper