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A pair of statements may be taken conjunctively or disjunctively; for example, "It lightens and it thunders," is conjunctive, "It lightens or it thunders" is disjunctive. Each such individual act of connecting a pair of statements is a new monad for the mathematician.

— Charles Sanders Peirce Mathematical Monads (1889)

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More quotes by Charles Sanders Peirce

The entire universe is perfused with signs, if it is not composed exclusively of signs.

Essays in Zoosemiotics (1990)

The idea does not belong to the soul; it is the soul that belongs to the idea.

Collected Papers (1931)

Mere imagination would indeed be mere trifling; only no imagination is mere.

Collected Papers (1931)

A sign is in a conjoint relation to the thing denoted and to the mind.

On The Algebra of Logic (1885)

It is important to understand what I mean by semiosis.

Pragmatism (1907)

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