Dubito ergo cogito; cogito ergo sum. (I doubt, therefore I think; I think therefore I am
Existence can mean several things. The existence of big foot or the Loch Ness monster has not been proven yet, even though many people search for these mysterious creatures. This term can also mean how you exist and live on a daily basis. If you live off the grid then your existence is very basic and limited, without electricity or running water provided by a local authority.