Many lines of poetry are so long-embedded in my memory that 
I find them appearing when I speak or write. Sometimes I am quoting. Sometimes I am unconsciously drawing from the reservoir. Some poets lend themselves to that, because they have found a way to say something important in words that seem almost inevitable. These words for the most part I made no effort to memorize. They simply found a place for themselves, and they stayed.

One poem I deliberately set out to memorize. In the eighth grade Sister Rosanne required us all to learn a poem by heart. I was assigned “To a Waterfowl,” by William Cullen Bryant. For years thereafter 
I regaled listeners with as much of it as they desired:

Whither, ’midst falling dew,
While glow the heavens with the last steps of day,
Far, through their rosy depths, dost thou pursue
Thy solitary way?