The Four Ages of Man by William Butler Yeats

He with body waged a fight,
But body won; it walks upright.
Then he struggled with the heart;
Innocence and peace depart.
Then he struggled with the mind;
His proud heart he left behind.
Now his wars on God begin;
At stroke of midnight God shall win.

More from William Butler Yeats:

• The Witch
• The Sorrow of Love
• There Is a Queen in China
• The Thorn Tree
• Three Songs to the Same Tune
• To a Child Dancing in the Wind