"Supposing is good, but finding out is better."

"Why is it that we can remember the least important things and forget the most important things?"

"It is noble to teach oneself, but still nobler to teach others — and less trouble."

"A lie can travel halfway around the world while the truth is still putting on its shoes."

"Giving up smoking is the easiest thing in the world. I know because I've done it thousands of times."