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That axiom of Metaphysicians which is termed the principle of contradiction and which affirms that it is impossible for anything to possess a quality, and in the same time not to possess it, is a consequence of the fundamental law of thought, whose expression is x²=x.

— George Boole An Investigation of the Laws of Thought (1854)

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More quotes by George Boole

The general laws of Nature are not, for the most part, immediate objects of perception.

An Investigation of the Laws of Thought (1854)

For how shall the finite comprehend the infinite?

An Investigation of the Laws of Thought (1854)

It is not of the essence of mathematics to be conversant with the ideas of number and quantity.

An Investigation of the Laws of Thought (1854)

I firmly believe, for the accomplishment of a purpose of the Divine mind...

George Boole (1854)

To deduce the laws of the symbols of Logic from a consideration of those operations of the mind which are implied in the strict use of language as an instrument of reasoning.

An Investigation of the Laws of Thought (1854)

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Quote text and notes from Wikiquote: George Boole (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.