Hatred, for the man who is not engaged in it, is a little like the odor of garlic for one who hasn't eaten any.

The least one can say of power is that a vocation for it is suspicious.

My pessimism extends to the point of even suspecting the sincerity of other pessimists.

Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god.

What makes our opponents useful is that they allow us to believe that without them we would be able to realize our goals.

When a scientist is ahead of his times, it is often through misunderstanding of current, rather than intuition of future truth. In science there is never any error so gross that it won't one day, from some perspective, appear prophetic.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.