Natural causes come together in Dick to make a pleasant psychological pattern, just as they come together in a sunset to make a pleasant pattern of colours. Presently (for that is how nature works) they will fall apart again and the pattern in both cases will disappear. Dick has had the chance to turn (or rather, to allow God to turn) that momentary pattern into the beauty of an eternal spirit: and he has not taken it.
There is a paradox here. As long as Dick does not turn to God, he thinks his niceness is his own, and just as long as he thinks that, it is not his own. It is when Dick realises that his niceness is not his own but a gift from God, and when he offers it back to God—it is just then that it begins to be really his own. For now Dick is beginning to take a share in his own creation. The only things we can keep are the things we freely give to God. What we try to keep for ourselves is just what we are sure to lose.
C.S. Lewis, Mere Christianity (1952; Harper Collins: 2001) 212-213.