The key word here is 'You' cant. If one accepts the concept of a divine/supreme being it stands to reason that perhaps that one could.
"In the Beginning was the word..."and so on.
In absolute reality there could not be, time. Time is a creation of man, the measurement of repitive motion like the cycles of the flooding of the Nile, or the moon. something man uses to distract itself.
When you get beyond that concept you come to realize there is only existence within a/the continuum. Consider for a moment the terms eternal and infinite.. Within 'eternal' time really means nothing because its always now a minute becomes the same as an hour or a year...just words or thoughts.. Within the infinite there can be no distance because there is no end. Think about that...no matter how long or far you travel you havent gone anywhere.
When it comes right down to it the only thing one can say with absolute certainty is:
"I Am".
Even if I am only, as Rene Descartes alluded, a the figment of an evil genius's imagination, still, I Am that.
Just as interesting, I (or anything), once having come to be, though coming not to be, can never come to not to have been.
Philosophy Maggot 401