Doe Quote by George Berkeley

I think therefore I exist.

— Rene Descartes

“("I think, therefore I am"), the idea that the mere act of thinking about one's existence proves there is someone there to do the…

— René Descartes

It is a primitive form of thought that things exist or do not exist.

— Arthur Eddington

All possible truth is practical. To ask whether our conception of chair or table corresponds to the real chair or table apart from the…

— G. Stanley Hall

I dream, therefore I exist.

— August Strindberg

“We perceive existence by means of words and names. To this or that vague, potential thing I will give a name, and it will…

— N. Scott Momaday

“It may sometimes happen that a truth, an insight, which you have slowly and laboriously puzzled out by thinking for yourself could have easily…

— Arthur Schopenhauer

“Meaning, yes -- I don't really exist except on the page or in the back of your brain. But if you think it's weird…

— Kyle Michel Sullivan

I think I exist, therefore I exist. I think.

— David Gerrold

I try to find meaning anywhere I can. It's the only way I know how to validate my existence.

— Tiffanie DeBartolo

“Observations are determined by the ability to fully perceive actually what exists rather that what is believed or desired to be real.”

— Steven Redhead

I am thinking, therefore I exist. (...) I was a substance whose whole essence or nature is solely to think, and which does not…

— Rene Descartes