How Do You Know You Exist?


When you’re awake, you know you’re awake. But when you aren’t, you don’t know you aren’t — so you can’t prove you aren’t dreaming. Maybe the body you perceive yourself to have isn’t really there. Maybe all of reality, even its abstract concepts like time, shape, color, and number are false.

“We don’t need to credit an all-seeing God with the creation of life and matter,” wrote Douglas Rushkoff, “to suspect that something wonderfully strange is going on in the dimension we call reality.” But what is the thing we call reality, exactly, and how are we even sure it is in the first place? Long before Philip K. Dick proclaimed that “reality is that which, when you stop believing in it, doesn’t go away” and E.F. Schumacher considered how we know what we know, the great French philosopher and mathematician René Descartes (March 31, 1596–February 11, 1650) tussled with these questions in his foundational 1641 treatise Meditations on First Philosophy (public library) — a quest to shake and uproot all beliefs not grounded in what is known with absolute certainty, and to advance a framework for what we can know beyond a shadow of a doubt.

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