I am the world that hides
The universal secret of all time
Destruction of the empty spaces
Is my one and only crime
I've lived a thousand times
I found out what it means to be believed
The thoughts and images
The unborn child that never was conceived
When little worlds collide
I'm trapped inside my embryonic cell
And flashing memories
Are cast into the never ending well
The name that scorns the face
The child that never sees the cause of man
The deathly darkness that
Belies the fate of those who never ran
You got to believe me
I'm talking to you [ Lyrics from: http://www.lyricsmode.com/lyrics/b/black_sabbath/a_national_acrobat.html ]
Well I know it's hard for you
To know the reason why
And I know you'll understand
More when it's time to die
Don't believe the life you have
Will be the only one
You have to let your body sleep
To let your soul live on
I want you to listen
I'm trying to get through
Love has given life to you
And now it's your concern
Unseen eyes of inner life
Will make your soul return
Still I look but not to touch
The seeds of life are sown
Curtain of the future falls
The secret stays unknown
Just remember love is life
And hate is living death
Treat your life for what it's worth
And live for every breath
Looking back I've lived and learned
But now I'm wondering
Here I wait and only guess
What this next life will bring
I don't think what supernaut said was right, i think that's a little of a stretch. But i do think that it has to do with living again, and reincarnation. It says several times things like, "lived a thousand times," and "don't believe the life you have will be the only one. "
The universal secret of all time is our life force. The lyrics are a brief glimpse into the world of that life force (god? ) as it calls the souls of the deceased back into the womb (the empty space) to be reincarnated when the sperm and the egg (little worlds) collide to create a new body. The life force has to cleanse the soul of memories from previous lives and deaths to allow the new body to start afresh and we are told to live each life to the full to make all the effort worthwhile, as each new life has free will and not even the life force knows what will happen during that lifetime.