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If an ɑ-machine prints two kinds of symbols, of which the first kind (called figures) consists entirely of 0 and 1 (the others being called symbols of the second kind), then the machine will be called a computing machine.

— Alan Turing On Computable Numbers, with an Application to the Entscheidungsproblem (1936)

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More quotes by Alan Turing

We can only see a short distance ahead, but we can see plenty there that needs to be done.

Computing Machinery and Intelligence (1950)

A computer would deserve to be called intelligent if it could deceive a human into believing that it was human.

Computing Machinery and Intelligence (1950)

I am not very impressed with theological arguments whatever they may be used to support. Such arguments have often been found unsatisfactory in the past.

Computing Machinery and Intelligence (1950)

Science is a differential equation. Religion is a boundary condition.

Epigram to Robin Gandy (1954)

This is only a foretaste of what is to come, and only the shadow of what is going to be.

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