Nothing which we can imagine about Nature is incredible.

Let that which is wanting in income be supplied by economy.

Man naturally yearns for novelty.

No man's abilities are so remarkably shining as not to stand in need of a proper opportunity.

The most disgraceful cause of the scarcity [of remedies] is that even those who know them do not want to point them out, as if they were going to lose what they pass on to others.

Such is the audacity of man, that he hath learned to counterfeit Nature, yea, and is so bold as to challenge her in her work.

The depth of darkness to which you can descend and still live is an exact measure of the height to which you can aspire to reach.