Until, the breath of this corporeal frame
And even the motion of our human blood
Almost suspended, we are laid asleep
In body, and become a living soul:
While with an eye made quiet by the power
Of harmony, and the deep power of joy,
We see into the life of things. I would say that this passage of this poem perhaps hints of immortality about becoming "a living soul" and "seeing into the life of things" suggesting that a living soul can never die and what we see in the life of things is something which never dies as long as there is organic life.
Answer:
a teach someone how to do something
Your answer would be B. He's talking about not being able to prove his age because he hasn't never seen a real record of his birth or anything else that would give him an idea of how old he is, so no real way to actually prove it.