No, it's not a number, its a concept, which is exactly my point. Numbers are finite and graspable, even if they exist only in the human mind. And certainly the human mind can invent something it can never really grasp. The afterlife for example. Whether it exists or not, it was our little ape brain that was first able to concieve of its existence. But concieving of something's existence does not mean one fully grasps it. I can beleive that the universe is infinite without ever really being able to concieve what infinite is. Like the topic starter stated, everything in our experience has a beginning and an end. That is how our minds are wired. Finitely.