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Science fiction, as I like to define it, is fiction based on the imagined exploration of scientific possibility. The distinction from fantasy—or from other sorts of fantasy—lies in the word possibility.

— Jack Williamson Will Academe Kill SF? (1978)

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More quotes by Jack Williamson

Human knowledge is never entirely consistent or complete, because the human brain is only a crude and transient mass of watery cells, error-prone and glacier-slow.

The Humanoid Universe (1980)

Human belief is seldom related to truth.

The Humanoid Universe (1980)

SF still appeals to the young, as always, because so much of it is set in the futures in which they will be living.

Will Academe Kill SF? (1978)

Accelerating change has become almost the first fact of life.

Will Academe Kill SF? (1978)

Conquerors live by conquest; the first failure is a signal for the conquered to rise against them.

Star Bridge (1955)

All Jack Williamson quotes →

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