jenn419 exactly Being born is a death sentance, you are destined to die some day. If everything is possible, is it possible for something to be impossible? Lets say you built a time machine, went into the future, stole some technology that has not been invented yet and then return to the present and claim you invented it. You get rich, become a billionaire for years to come, untill someone breaks into your house and steals it, theorericly "you" stole it from yourself, but because you stole it, you don't know what it is or how it was made, so, the question that arises is... who invented the technology? If god is everywhere, he is in hell.
Another paradox like the grandfather paradox: You go back in time to stop the assassination of president Lincoln. You succeeded, and he dies of old age. Now, long after that, you would have no reason to go back in time. And, now we have a paradox.
But you would go into the future after you stop his assasination, therefore you would have already done it, You would not go into a past where you havent yet done it.
SOOO what you must do is go back ONE year, give yourself a note saying to go back in time and kill John Wilkes Booth in exactly one year BUT send yourself this note one year back before killing him THEN go kill him :D