"Knowledge of languages is the doorway to wisdom."
"[I]f in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge in mathematics, in so far as disposed through it we are able to reach certainty in other sciences and truth by the exclusion of error."
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Source: Opus Majus bk. 1, ch. 4 (ca. 1267) (translation by Robert Burke)
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"Reasoning draws a conclusion, but does not make the conclusion certain, unless the mind discovers it by the path of experience."
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