The subject of the poem usually dictates the rhythm or the rhyme and its form. Sometimes, when you finish the poem and you think the poem is finished, the poem says, "You're not finished with me yet," and you have to go back and revise, and you may have another poem altogether. It has its own life to live.
Maya AngelouYou rose into my life like a promised sunrise, brightening my days with the light in your eyes. I've never been so strong. Now I'm where I belong.
Maya Angelou