There is a distinction, but no opposition, between theory and practice. Each to a certain extent supposes the other. Theory is dependent on practice; practice must have preceded theory.

An instinct is an agent which performs blindly and ignorantly a work of intelligence and knowledge.

Read much, but not many works.

Logic is the science of the laws of thought, as thought,--that is of the necessary conditions to which thought considered in itself is a subject.

Metaphysics, in whatever latitude the term be taken, is a science, or complement of sciences, exclusively occupied with mind.

In our natural body every part has a necessary sympathy with every other; and all together form, by their harmonious conspiration, a healthy whole.

Truth like a torch, the more 'tis shock, it shines.

The pursuit of knowledge is but a course between two ignorances, as human life is itself only a wayfaring from grave to grave.

Be sober, and to doubt prepense, These are the sinews of good sense.

A judgment is the mental act by which one thing is affirmed or denied of another.

Consummated science is positively humble.

Have the nature of a dervish: then wear a stylish cap.

We were fighting about nothing important while dreaming of the same things.

If all were equalized by death, as the medieval idea constantly emphasized, was it not possible that inequalities on earth were contrary to the will of God?

Wealth: A cunning device of Fate whereby men are made captive, and burdened with responsibilites from which only Death can file their fetters.

And the dreams that you dare to dream really do come true.

The world should commit Israel to withdraw from our territories and stop occupation and aggression, and allow the Palestinian people to establish their independent state.

Ice and iron cannot be welded.

I never loved totalitarianism and all the ideas of making mankind happy always seemed crazy to me.

No offense to hot girls everywhere- but newsflash- there are hot girls everywhere.

It is always better to have no ideas than false ones; to believe nothing, than to believe what is wrong.