The Quotation Index — Search results

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Necessity is the mistress and guide of nature.

Leonardo da Vinci The Notebooks of Leonardo Da Vinci · 1888

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Book of the week

Ideas and Opinions

Essay collection · 1954

A collection of non-technical writings by Albert Einstein on science, religion, ethics, politics, pacifism and education, drawn from across his career.

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Author of the month

Marie Curie

Physicist and chemist · 1867-1934

Pioneering researcher on radioactivity who discovered polonium and radium and won two Nobel Prizes.

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