Doubt

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DOUBT: Galileo called doubt the father of invention; it is certainly the pioneer. (Christian Nestell Boyee, U.S. writer, 1820-1904)

DOUBT: We know accurately only when we know little; with knowledge doubt increases. (Johann Wolfgang von Goethe, German poet, dramatist, novelist, and philosopher, 1749-1832)

DOUBT: Doubt everything. Find your own light. (Gautama Buddha, an Asian ascetic and sage, on whose teachings Buddhism was founded and who lived sometime between the sixth and fourth centuries BCE)

DOUBT: If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things. (Rene Descartes, French philosopher and mathematician, 1596-1650)

DOUBT: Unless you have the courage to doubt you will never come to know the truth. (Osho, Indian mystic, guru, and spiritual teacher, 1931-1990)