“What is your idea of earthly happiness? To be vindicated in my own lifetime.”

“Scientists have an expression for hypotheses that are utterly useless even for learning from mistakes. They refer to them as being "not even wrong." Most so-called spiritual discourse is of this type.”

“What do you most value in your friends?Their continued existence.”

“About once or twice every month I engage in public debates with those whose pressing need it is to woo and to win the approval of supernatural beings. Very often, when I give my view that there is ...”

“It is exactly the fear of revenge that motivates the deepest crimes, from the killing of the enemy's children lest they grow up to play their own part, to the erasure of the enemy's graveyards and ...”

“It's probably a merciful thing that pain is impossible to describe from memory”

“The land of easy mathematics where he who works adds up and he who retires subtracts.”

“At the age of 45, most days in Tucson were spent feeling like I was on the summit of Mauna Kea, as I was exhibiting debilitating health symptoms that corresponded to what I saw at very high altitud...”

“The hour is only long thus, if you've waited.”

“Age has no reality except in the physical world. The essence of a human being is resistant to the passage of time. Our inner lives are eternal, which is to say that our spirits remain as youthful a...”

“How many loved your moments of glad grace, And loved your beauty with love false or true; But one man loved the pilgrim soul in you, And loved the sorrows of your changing face.”

“I am incapable of conceiving infinity, and yet I do not accept finity. I want this adventure that is the context of my life to go on without end.”