"I am an invisible man. No, I am not a spook like those who haunted Edgar Allan Poe; nor am I one of your Hollywood-movie ectoplasms. I am invisible, understand, simply because people refuse to see me."

"Even a good decision if made for the wrong reasons can be a wrong decision."

"The secret is here in the present. If you pay attention to the present, you can improve upon it. And if you improve on the present, what comes later will also be better."

"The tallest blade of grass is the first to be cut by the scythe."

"What I wanted to do was work with kids with behavioral and emotional handicaps. It's a puzzle, learning each child, because each child is different."

"Education is what you get from reading the fine print. Experience is what you get from not reading it."

"Science when well-digested is nothing but good sense and reason."

"Daring ideas are like chessmen moved forward. They may be beaten, but they may start a winning game."

"To what purpose should I trouble myself in searching out the secrets of the stars, having death or slavery continually before my eyes?"

"Keep in mind that neither success nor failure is ever final."

"The family is the nucleus of civilization."

"An army marches on its stomach."