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Henri Poincaré — Portrait after a picture (public domain), via Wikimedia Commons.

The quotations of

Henri Poincaré

French mathematician, physicist and engineer

1854–1912

8 quotes, most often on Science, Thinking and Facts.

To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection.
Preface, Dover abridged edition (1952), p. xxii
- Thinking
It is by logic that we prove, but by intuition that we discover. To know how to criticize is good, to know how to create is better.
Science and Method (1908), Part II. Ch. 2: Mathematical Definitions and Education, p. 129
- Science
- Thinking
Thought is only a gleam in the midst of a long night. But it is this gleam which is everything.
The Value of Science (1905), Ch. 11: Science and Reality
- Thinking

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