“It only takes 20 years for a liberal to become a conservative without changing a single idea.”

“belief is the death of intelligence.”

“...an optimistic mind-set finds dozens of possible solutions for every problem that the pessimist regards as incurable.”

“...when dogma enters the brain, all intellectual activity ceases. ”

“...reality is always plural and mutable.”

“We look for the Secret - the Philosopher's Stone, the Elixir of the Wise, Supreme Enlightenment, 'God' or whatever...and all the time it is carrying us about...It is the human nervous system itself.”