Certainty quotes & sayings

These certainty quotes and certainty sayings are from our famous and inspiring quotes collection.
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Doubt is not a pleasant condition, but certainty is an absurd one. - Voltaire


When I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream? - Rene Descartes


To believe with certainty we must begin with doubting. - Stanislaus I


A thousand reasoned opinions are never equal to one case of diving in and finding out. Galileo proved that and it may be the only certainty we have. (Time Enough for Love) - Robert A. Heinlein


If I knew for a certainty that a man was coming to my house with the conscious design of doing me good, I should run for my life. - Henry David Thoreau


If you develop the absolute sense of certainty that powerful beliefs provide, then you can get yourself to accomplish virtually anything, including those things that other people are certain are impossible. - William Lyon Phelps


One must learn by doing the thing; though you think you know it, you have no certainty until you try. - Sophocles


The only unchangeable certainty is that nothing is unchangeable or certain. - John Fitzgerald Kennedy


The responses of human beings vary greatly under dangerous circumstances. The strong man advances boldly to meet them head on. The weak man grows agitated. But the superior man stands up to fate, endures resolutely in his inner certainty If ignorant both. - I Ching