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All those who offer an opinion on any doubtful point should first clear their minds of every sentiment of dislike, friendship, anger or pity.

A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him.

If, amid the multitude of contending counsel, you have hesitated and doubted; if, when a great measure suggested itself, you have shrunk from the vast responsibility, afraid to go forward lest you should go wrong, what wonder?

Suspicion and doubt lead to animosity and hatred.

To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection.

The usual fortune of complaint is to excite contempt more than pity.

Much that we call evil is really good in disguises; and we should not quarrel rashly with adversities not yet understood, nor overlook the mercies often bound up in them.

Only a well-rounded intellect, a spirit nourished in the eternal sources of intelligence and culture, of justice and wisdom, is a safeguard against both indifference and skepticism.

The deplorable mania of doubt exhausts me. I doubt about everything, even my doubts.