My Heart Leaps up When I Behold - William Wordsworth

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 could wish my days to be
Bound each to each by natural piety.