it's about truth.

O he was so very human
mostly flesh, and blood and bones
like the normal ones
He even had a face, and I heard tell of his heart. (once)
I heard tell of his soul,
and even his potential of a great desgin
Just, he was so very human

So he made mistakes
That fatal mistake of breathing in only oxygen
the mistake of circulating blood only through his brain
So much blood that he thought that that was being alive

He could feel, and he could see
 as was his right
But he made a mistake, one last mistake
The mistake of only being human