Let us then suppose the mind to be, as we say, white paper, void of all characters, without any ideas; how comes it to be furnished? ... To this I answer, in one word, from experience.

The end of law is not to abolish or restrain, but to preserve and enlarge freedom.

Being all equal and independent, no one ought to harm another in his life, health, liberty, or possessions.

The labour of his body and the work of his hands, we may say, are properly his. Whatsoever then he removes out of the state that nature hath provided ... he hath mixed his labour with, and joined to it something that is his own, and thereby makes it his property.

Behold what is absent as firmly present through the mind.

-- Parmenides

I know that I am intelligent, because I know that I know nothing.

-- Socrates

Reserve your right to think, for even to think wrongly is better than not to think at all.

-- Hypatia

A great many people think they are thinking when they are merely rearranging their prejudices.

-- William James

The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.

-- Bertrand Russell

Knowledge is the conformity of the object and the intellect.

-- Averroes