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All existing things upon this earth, which have knowledge of their own existence, possess, some in one degree and some in another, the power of thought, accompanied by perception, which is the awakening of thought by the effects of external objects upon the senses.

— Augustus De Morgan Formal Logic (1847)

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More quotes by Augustus De Morgan

The lowest steps of the ladder are as useful as the highest.

On the Study and Difficulties of Mathematics (1831)

The moving power of mathematical invention is not reasoning, but imagination.

If much difficulty should be experienced in the elementary chapters, I know of no work which I can so confidently recommend to be used with the present one, as that of M. Duhamel.

The Differential and Integral Calculus (1836)

The work now before the reader is the most extensive which our language contains on the subject.

The Differential and Integral Calculus (1836)

I am far from saying that this Treatise will be easy; the subject is a difficult one, as all know who have tried it.

The Differential and Integral Calculus (1836)

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