All great authors are seers.

Many a genius has been slow of growth. Oaks that flourish for a thousand years do not spring up into beauty like a reed.

Insincerity is always weakness; sincerity even in error is strength.

In its happiest efforts, translation is but approximation, and its efforts are not often happy. A translation may be good as translation, but it cannot be an adequate reproduction of the original.

Science is not addressed to poets.

No man ever made a great discovery without the exercise of the imagination.

In complex trains of thought signs are indispensable.