My Heart Leaps Up

When I behold
A rainbow in the sky
So was it when my life began
So is it now I am a man
So be it when I shall grow old
- or let me die!
The child is father of the man
And I should wish my days to be
Bound each to each by natural piety.

- Wordsworth

In a nutshell - Wordsworth was a great old guy who loved nature and hoped that he always would see it with the same childhood innocence.