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Danh ngôn của Henri Poincare (Sứ mệnh: 9)

Science is built up of facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.
The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.
It is through science that we prove, but through intuition that we discover.
Mathematics is the art of giving the same name to different things.
A very small cause which escapes our notice determines a considerable effect that we cannot fail to see, and then we say that the effect is due to chance.