“It may be hard for an egg to turn into a bird:
it would be a jolly
sight harder for it to learn to fly
while remaining an egg.
We are like
eggs at present.
And you cannot go on indefinitely being just an
ordinary, decent egg.
We must be hatched or go bad. ”
- C. S. Lewis, from Mere Christianity, (p. 198-199, or 170-171, depending on edition)