People often think of Christian morality as a kind of bargain in which God says, “If you keep a lot of rules, I’ll reward you; and if you don’t, I’ll do the other thing.” I do not think that’s the best way of looking at it. I would much rather say that every time you make a choice, you are turning the central part of you, the part that chooses, into something a little different than what it was before. And, taking your life as a whole, with all your innumerable choices, all your life long you are slowly turning this central thing either into a heavenly creature or into a hellish creature; either into a creature that is in harmony with God and with other creatures and with itself, or else into one that is in a state of war and hatred with God and with its fellow creatures and with itself. To be the one kind of creature is heavenly, i.e., it is joy and peace and knowledge and power; to be the other means madness, horror, idiocy, rage, impotence, and eternal loneliness. Each of us, at each moment, is progressing to the one state or the other.
–C. S. Lewis