"Never get to the point where you will be ashamed to ask anybody for information. The ignorant man will always be ignorant if he fears that by asking another for information he will display ignorance. Better once display your ignorance of a certain subject than always know nothing of it."

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Everyone is free to set up an opinion and to adduce proofs in support of it. Whether, though, a scientist shall find it worth his while to enter into serious investigations of opinions so advanced is a question which his reason and instinct alone can decide. If these things, in the end, should turn out to be true, I shall not be ashamed of being the last to believe them.

— Ernst Mach