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

Life becomes harder for us when we live for others, but it also becomes richer and happier.
Albert Schweitzer

I want to be thoroughly used up when I die, for the harder I work the more I live. I rejoice in life for its own sake.
George Bernard Shaw

The nobler a man, the harder it is for him to suspect inferiority in others.
Marcus Tullius Cicero

There is nothing harder than the softness of indifference.
Clare Boothe Luce