Fools act on imagination without knowledge, pedants act on knowledge without imagination

In formal logic, a contradiction is the signal of defeat: but in the evolution of real knowledge, it marks the first step in progress toward victory.

Not ignorance, but ignorance of ignorance is the death of knowledge

In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory

Knowledge shrinks as wisdom grows.

Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.