I would like to put a twist on Descartes' famous phrase, "Cogito, ergo sum".
Effectively I want to say, "I am... I think?", raising the question of whether the existence we perceive with our senses is the truth of reality, and in exploring that: whether Descartes' position is still a valid argument.
So would it be correct to say "Ego sum... cogito?" and if not, how would you phrase it in Latin?