Summary

Portrait of John Locke John Locke An Essay Concerning Human Understanding…

For man knows that he himself exists. I think it is beyond question, that man has a clear idea of his own being ; he knows certainly he exists, and that he is something. He that can doubt whether he be anything or no, I speak not to ; no more than I would argue with pure nothing, or endeavour to convince nonentity that it were something. If any one pretends to be so sceptical as to deny his own existence, (for really to doubt of it is manifestly impossible,) let him for me enjoy his beloved happiness of being nothing, until hunger or some other pain convince him of the contrary.
Source: Wikisource

Portrait of John Locke John Locke An Essay Concerning Human Understanding…

I reply, that then it was impossible there should ever have been any knowledge : it being as impossible that things wholly void of knowledge, and operating blindly, and without any perception, should produce a knowing being, as it is impossible that a triangle should make itself three angles bigger than two right ones. For it is as repugnant to the idea of senseless matter, that it should put into itself sense, perception, and knowledge, as it is repugnant to the idea of a triangle, that it should put into itself greater angles than two right ones.
Source: Wikisource

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