We are by nature observers, and thereby learners. That is our permanent state.

The wise skeptic does not teach doubt but how to look for the permanent in the mutable and fleeting.

Nature encourages no looseness, pardons no errors.

A life in harmony with nature, the love of truth and virtue, will purge the eyes to understanding her text.

Nothing is rich but the inexhaustible wealth of nature. She shows us only surfaces, but she is a million fathoms deep.

Nature... She pardons no mistakes. Her yea is yea, and her nay, nay.