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" "One must know when it is right to doubt, to affirm, to submit. Anyone who does otherwise does not understand the force of reason. Some men run counter to these three principles, either affirming that everything can be proved, because they know nothing about proof, or doubting everything, because they do not know when to submit, or always submitting, because they do not know when judgment is called for.
Blaise Pascal (19 June 1623 – 19 August 1662) was a French mathematician, logician, physicist and theologian.
Biography information from Wikiquote
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