"If people become accustomed to lying, they will unconsciously commit every possible wrong deed. Before they can act wickedly, they must lie and once they begin to lie they will act wickedly without concern."

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These long chains of perfectly simple and easy reasonings by means of which geometers are accustomed to carry out their most difficult demonstrations had led me to fancy that everything that can fall under human knowledge forms a similar sequence; and that so long as we avoid accepting as true what is not so, and always preserve the right order of deduction of one thing from another, there can be nothing too remote to be reached in the end, or to well hidden to be discovered.

— Rene Descartes