"Of all the frictional resistances, the one that most retards human movement is ignorance."

"I loved that pigeon as a man loves a woman, and she loved me. As long as I had her, there was a purpose to my life."

"The future of humanity lies in the utilization of the sun's energy."

"The progressive development of man is vitally dependent on invention. It is the most important product of his creative brain."

"Of all the frictional resistances, the one that most retards human movement is ignorance, what Buddha called 'the greatest evil in the world.'"