This world is so full of care and sorrow that it is a gracious debt we owe to one another to discover the bright crystals of delight hidden in somber circumstances and irksome tasks.

The marvelous richness of human experience would lose something of rewarding joy if there were no limitations to overcome. The hilltop hour would not be half so wonderful if there were no dark valleys to traverse.

Life is a daring adventure or nothing.

My optimism is grounded in two worlds, myself and what is about me. I demand that the world be good, and lo, it obeys. I proclaim the world good, and facts range themselves to prove my proclamation overwhelmingly true.

I have depended on books not only for pleasure and for the wisdom they bring to all who read, but also for that knowledge which comes to others through their eyes and their ears.

The infinite wonders of the universe are revealed to us in exact measure as we are capable of receiving them. The keenness of our vision depends not on how much we can see, but on how much we feel.

God himself is not secure, having given man dominion over his work.