THE little bird sits in the nest and sings 
A shy, soft song to the morning light; 
And it flutters a little and prunes its wings. 
The song is halting and poor and brief, 
And the fluttering wings scarce stir a leaf; 
But the note is a prelude to sweeter things, 
And the busy bill and the flutter slight 
Are proving the wings for a bolder flight!
Paul Laurence Dunbar
http://www.poemhunter.com/poem/preparation-3/