Descartes,in his search for the truth,

Question

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Descartes famously coined the phrase "I think, therefore I am" and argued that the mere act of questioning his own existence proved that he existed. He did not doubt the existence of God and believed that the mind and body were separate entities, which means that he did not always believe his body was present. Although he did question the reliability of his senses, he did not doubt the truth of his own mental processes.

Descartes,in His Search for the Truth