what science cannot discover, mankind cannot know.
• Variant: "What science cannot tell us, mankind cannot know." (Attributed to Russell in Ted Peters' Cosmos As Creation: Theology and Science in Consonance [1989], p. 14, with a note that it was "told [to] a BBC audience [earlier this century]")." - Meaning and context.">
Religion and Science (1935), Ch. IX: Science of Ethics.

While it is true that science cannot decide questions of value, that is because they cannot be intellectually decided at all, and lie outside the realm of truth and falsehood. Whatever knowledge is attainable, must be attained by scientific methods; and what science cannot discover, mankind cannot know.
• Variant: "What science cannot tell us, mankind cannot know." (Attributed to Russell in Ted Peters' Cosmos As Creation: Theology and Science in Consonance [1989], p. 14, with a note that it was "told [to] a BBC audience [earlier this century]").

— Bertrand Russell

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "While it is true that science cannot decide questions of value, that is because they cannot be intellectually decided at all, and lie outside the realm of truth and falsehood. Whatever knowledge is attainable, must be attained by scientific methods; and what science cannot discover, mankind cannot know.
• Variant: "What science cannot tell us, mankind cannot know." (Attributed to Russell in Ted Peters' Cosmos As Creation: Theology and Science in Consonance [1989], p. 14, with a note that it was "told [to] a BBC audience [earlier this century]")." in the context of "Religion and Science (1935), Ch. IX: Science of Ethics." to mean that wisdom is timeless.

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Source: Wikiquote: "Bertrand Russell" (Quotes, 1930s) The 'What it means' explanation text was generated by Google Gemini Flash (accessed February 08, 2026). https://gemini.google.com/app
Bertrand Russell

About Bertrand Russell

Bertrand Arthur William Russell, 3rd Earl Russell (May 18, 1872 – February 2, 1970) was a British philosopher, logician, mathematician, historian, and social critic. In 1950, he was awarded a Nobel Prize in Literature.