Please explain the fifth stanza in Wordsworth's "Ode: Intimations of Immortality."

In stanza five of Wordsworth's "Ode: Intimations of
Immortality," "the narrator explains how humans start in an ideal world that slowly
fades into a shadowy life..."

The poet introduces his
idea that we dwell in heaven before we are born and joined with our
bodies; as infants, we retain a strong sense or memory of what heaven is
like.

But
trailing clouds of glory do we come

From God, who is our
home:

Heaven lies about us in our
infancy!

However, as a
"growing boy..."

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Shades of the prison-house
begin to
close...

But
He beholds the light, and whence it flows,

He sees it in
his joy...

As the young boy
begins to grown, the "prison house," a disconnection between our souls prior to birth,
which has remained in infancy, is beginning to fade—though the young boy is still
just close enough to heaven to see the light, know where it is
coming from, and find joy in the world. Wordsworth infers that the young boy is
approaching a precipice, almost ready to move into unknown and dark
territories, where heaven's light will be no longer visible, and will be
forgotten.

In
childhood, according to Wordsworth, one’s own immortality is intuited and so young
people are perpetually joyful; they have a “heart of May” not because their bodies are
strong and capable but because of their spiritual
health.

Wordsworth makes his
argument that what makes young people capable is not their physical health, but their
spiritual well-being: close at hand because they are still young and still connected to
the source of their soul's initial joy: heaven.

The youth
moves even farther from heaven, closer to the "precipice," but
still a glimmer of heaven remains on the fringes of his awareness:
though he is growing up and growing away from "spiritual health," he is "still Nature's
priest." As a early Romantic poet, one of the elements in life Wordsworth felt was so
important was one's connection to nature and the natural
world.

As the youth becomes a Man, his connection to his
"early form" is lost in the realities of the world: its obligations, work and trials.
Nothing is left of that joyful sense that had earlier tied the Man to heaven as a baby.
He loses hope as he plods along, continually without release, through each "common
day."