“An empty man is full of himself.”

“If industrial man continues to multiply his numbers and expand his operations he will succeed in his apparent intention, to seal himself off from the natural and isolate himself within a synthetic prison of his own making.”

“Ah yes, the head is full of books. The hard part is to force them down through the bloodstream and out through the fingers.”

“I am hopeful, though not full of hope, and the only reason I don't believe in happy endings is because I don't believe in endings.”

“Walking is the only form of transportation in which a man proceeds erect - like a man - on his own legs, under his own power. There is immense satisfaction in that.”

“As to the charge that I am a cranky old man, I plead guilty.”

“When a man's best friend is his dog, that dog has a problem.”