Every person, as a self, body, or both, knows they exist. But that knowledge is certainly variable with concern to each one, as a lot of philosophies about proving one's existence have emerged, and are known for their common contradictions.
What's yours? I would like to hear from you. — Unlimiter
I just ate some kielbasa. — Terrapin Station
Because you know you'll die. — Anthony
If I could prove the relative physicalistic existence of my being (exist, as the general natural world) no one would understand it and I’d no longer ‘exist’. It’s more about the question being limited in it’s range and assuming it means something ‘beyond’ comprehension. — I like sushi
On what ground can it be doubted? — creativesoul
Thus the reality or existence of ourself is observable & identifiable with these particular & actual states of thought or perception, & isn’t to be looked for beyond or outside of these. — aRealidealist
What would be irrational would be to doubt where doubt is incoherent. — Banno
"Cogito Ergo Sum". According to prof John Cottingham (Reading) in the "Oxford Companion to Philosophy" this is perhaps the most celebrated philosophical dictum of all time. Perhaps someone on this forum feels like doing a master's dissertation on the topic - especially if the era of the Enlightenment is what turns you on! — Daniel C
Proving existence then involves demonstrating an absence of contradictions and proving nonexistence requires one to show that a contradiction follows. — TheMadFool
I thought the Devil's greatest trick was convincing the world he doesn't exist. — TheMadFool
Mess with that, and your sense of self consciousness/identity should degrade and vanish into a chaos ideas, facts, memories but without any form, function, or purpose, which I not call that ‘thought’ or ‘thinking’, so a problem to the Descartes way of evidencing oneself. — Sir Philo Sophia
The skeptic just doesn't get anywhere, doesn't move the conversation forward, and, in the end, is just kinda boring. — Artemis
How do we define exist and how do we know if we die is the next stupid question that will be asked. — christian2017
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