“The best mind altering drug is the truth.”

“I love to think. I once considered taking drugs as an attempt to better understand an altered state of mind; however, I decided not to. I didn't want to chance ruining the machine.”

“When you alter yourself, the alterations become the truth...”

“When at the typewriter I am no longer where I site but am away across the mountains, in ancient cities or on the Great Plains among the buffalo. Often I think of what pitiful fools are those who use mind-altering drugs to seek feelings they do not have, each drug taking a little more from what they have of mind, leaving them a little less. Give the brain encouragement from study, from thinking, from visualizing, and no drugs are needed.”

“The greatest discovery of any generation is that human beings can alter their lives by altering the attitudes of their minds.”

“Not he is great who can alter matter, but he who can alter my state of mind.”