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" "Tem de admitir-se que é verdade que saber qualquer coisa não implica pensar nisso - mas alguém que saiba de alguma coisa não tem de ser capaz de duvidar dela? E duvidar significa pensar.
Ludwig Wittgenstein (26 April 1889 – 29 April 1951) was an Austrian-born philosopher who spent much of his life in England.
Biography information from Wikiquote
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