The intellect must not be kept at consistent tension, but diverted by pastimes.... The mind must have relaxation, and will rise stronger and keener after recreation.

How many discoveries are reserved for the ages to come when our memory shall be no more, for this world of ours contains matter for investigation for all generations.

He deserves praise who does not what he may, but what he ought.

Virtue needs a director and guide. Vice can be learned even without a teacher.

There is no grace in a benefit that sticks to the fingers.

Truth will never be tedious unto him that travelleth in the secrets of nature; there is nothing but falsehood that glutteth us.

The pressure of adversity does not affect the mind of the brave man. It is more powerful than external circumstances.