"The engaged mind stays sharp and retains tremendous capacity."

"It is man's own fault, it is from want of use, if his mind grows torpid in old age."

"When the mind tries to guess the trajectory of a future moral act and concentrates too strenuously on contr…"

"I believe that with the advent of acid, we discovered a new way to think, and it has to do with piecing tog…"

"Bad as I am thought, I cannot express the horror I feel at this atrocity."

"Definitions, like questions and metaphors, are instruments for thinking. Their authority rests entirely on …"

"The working of great administrations is mainly the result of a vast mass of routine, petty malice, self-int…"