All the scientist creates in a fact is the language in which he enunciates it. If he predicts a fact, he will employ this language, and for all those who can speak and understand it, his prediction is free from ambiguity. Moreover, this prediction once made, it evidently does not depend upon him whether it is fulfilled or not.
Henri PoincareIdeas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination.
Henri PoincareIt 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.
Henri PoincareAstronomy is useful because it raises us above ourselves; it is useful because it is grand; .... It shows us how small is man's body, how great his mind, since his intelligence can embrace the whole of this dazzling immensity, where his body is only an obscure point, and enjoy its silent harmony.
Henri Poincare