Belief is when someone else does the thinking. – Buckminster Fuller, 1972

Men who borrow their opinions can never repay their debts. – George Savile, Marquess de Halifax, Miscellaneous Thoughts and Reflections

Physiological response to thinking and to pain is the same; and man is not given to hurting himself. – Martin H. Fischer (1879–1962)

Some people do not become thinkers simply because their memories are too good. – Friedrich Wilhelm Nietzsche