When a doubt is once received, men labour rather how to keep it a doubt still, than how to solve it; and accordingly bend their wits.

The doctrines of religion are resolved into carefulness; carefulness into vigorousness; vigorousness into guiltlessness; guiltlessness into abstemiousness; abstemiousness into cleanliness; cleanliness into godliness.

A man that studieth revenge keeps his own wounds green.

Time is the greatest innovator.

The errors of young men are the ruin of business, but the errors of aged men amount to this, that more might have been done, or sooner.

But by far the greatest obstacle to the progress of science and to the undertaking of new tasks and provinces therein is found in this-that men despair and think things impossible.

A just fear of an imminent danger, though be no blow given, is a lawful cause of war.