Knowledge which is acquired under compulsion obtains no hold on the mind.

The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant.

Either we shall find what it is we are seeking or at least we shall free ourselves from the persuasion that we know what we do not know.

To appreciate the beauty of a snow flake, it is necessary to stand out in the cold.

No trace of slavery ought to mix with the studies of the freeborn man. No study, pursued under compulsion, remains rooted in the memory.

Knowledge is true opinion.