René Descartes Quotes
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I believe that all those to whom God has given the use of reason are bound to use it mainly to know Him and to know themselves. This is where I endeavored to begin my own research, and I can say that I would have been unable to find the foundation of physics had I not sought after them in this way In William R. Shea
But there is I know not what being, who is possessed at once of the highest power and the deepest cunning, who is constantly employing all his ingenuity in deceiving me. Doubtless, then, I exist, since I am deceived; and, let him deceive me as he may, he can never bring it about that I am nothing, so long as I shall be conscious that I am something. So that... this proposition I am, I exist, is necessarily true each time it is expressed by me, or conceived in my mind.