Cogito ergo sum.
I think, therefore I am.
But as the old joke goes, Descartes walked into a bar, and the bartender asked if he wanted a drink.
Descartes replied, ” I think not,” and promptly blinked out of existence.
Ever run into someone who, because they think something, then that MUST be the truth? And conversely, if they don’t think something, that thing CANNOT POSSIBLY be the truth?
If a lack of belief in X means that X is not true, does it follow that if you don’t see Y then Y doesn’t exist? If you’ve never heard a song by artist Z, is the song imaginary?
When he sits in a totally darkened room, in complete silence, does he cease to exist? When he sleeps, do I cease to exist?
I’ve never been inside Fort Knox; so that gold must not exist, huh?
“O that way madness lies; let me shun that. No more of that.”