I think therefore I am. I doubt therefore I might be.

Cogito, ergo sum. I think, therefore I am.

I sink, therefore I swam.

I think, therefore I have a brain.

I think, therefore I must be a nice person.

I think there for i am. ricky gervais put this better than i can :P 

It means That maybe were all dead, maybe were all imagining this in our heads BUT!.. as long as i am thinking at leats i am 'being' in some way..  Its something very similier to that anyway. Enjoy the rest of your evening

you need to complete the question in order to get an answer. i think therefore i think .

Ahah, actually, Descartes later revised this to "I think, i am", because he did not want the phrase to take the form of an argument. =}