Existence exists. Period. No qualifier necessary.
More along the lines of Descartes' "Cogito ergo sum" (I think therefore I am). Existence without thinking (reasoning) is a lowly existence, subhuman, no better than livestock. Nietzsche, anyone?
Backwards. You ARE, then you are able to think. It is called primacy of existence, Ayn Rand. You cannot think without first existing; you cannot be conscious to think without first existing. If you don't exist, how do you think?
These are the questions.....