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All truth passes through three stages. First, it is ridiculed.Second, it is violently opposed. Third, it is accepted as beingself-evident. (Arthur Schopenhauer)

Each problem that I solved became a rule which served afterwards to solve other problems. (Rene Descartes, Discours de la Methode)

Whether you think that you can, or that you can’t, you are usually right. (Henry Ford)

https://www.youtube.com/watch?v=1rjoQ-knMGU