"The Sufis advise us to speak only after our words have managed to pass through three gates. At the first gate, we ask ourselves, 'Are these words true?' If so, we let them pass on; if not, back they go. At the second gate, we ask, 'Are the necessary?' At the last gate, we ask, 'Are they kind?'"

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If you want to find out anything from the theoretical physicists about the methods they use, I advise you to stick closely to one principle: don't listen to their words, fix your attention on their deeds. To him who is a discoverer in this field the products of his imagination appear so necessary and natural that he regards them, and would like to have them regarded by others, not as creations of thought but as given realities.

— Albert Einstein