Who are some of the best authors of inspirational poems?

According to an article on Yahoo! Voices, the top ten best inspirational poems are: "Success" by Berton Brailey, "If" by Rudyard Kipling, "Invictus" by William Earnest Henley, "Don't Quit" (author unknown), "The Road Not Taken" by Robert Frost, "Start Where You Stand" by Berton Brailey, "The Man Who Thinks He Can" by Walter D. Wintle, "Climb Till Your Dreams Come True" by Helen Steiner Rice, "The Art of Start" by Charles Ghigna, and "The Daffodils Poem" by William Wordsworth.