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Henri Poincare
Science is built...
Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a...
To doubt everything...
To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of...
Ideas rose in...
Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable...
Invention consists in...
Invention consists in avoiding the constructing of useless contraptions and in constructing the useful combinations...
Thus, be it...
Thus, be it understood, to demonstrate a theorem, it is neither necessary nor even advantageous to know what it means...