Did I exist ? Am I existing or Will I exist?

In Potthapada Sutta Buddha asks Citta similar question. > "Suppose they were to ask you: 'Did you exist in the past? Did you not > not exist? Will you exist in the future? Will you not not exist? Do > you exist now? Do you not not exist?' Thus asked, how would you > answer?" > > "... Thus asked, lord, I would answer: 'I existed in the past. I did > not not exist. I will exist in the future. I will not not exist. I > exist now. I do not not exist.'... That's how I would answer." If I interpret it correctly Citta essentially says that he existed in the past , will exist in the future and that he is existing now. This conclusion contradicts the position that self is an error, illusion or is like a dream because when an error is corrected it vanishes(self is annihilated). Self has both origin and an end then how can Citta say that he is existing now, he existed in the past and that he will exist in the future? I am simply repeating the question Buddha asked to Citta because the answer looked contradictory to me. The questions are : Did I exist ? Am I existing? Will I exist ?