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For purposes of action nothing is more useful than narrowness of thought combined with energy of will.

Nothing is more active than thought, for it travels over the universe, and nothing is stronger than necessity for all must submit to it.

The only way to get the best of an argument is to avoid it.

A thought which does not result in an action is nothing much, and an action which does not proceed from a thought is nothing at all.

One must not attempt to justify them, but rather to sense their nature simply and clearly.

Academics don't normally manage to alter people's way of thinking through their strength of argument.

There is no philosophy without the art of ignoring objections.

The difficult part in an argument is not to defend one's opinion but rather to know it.