When contemporary composer John Muehleisen set Henry Wadsworth Longfellow’s poem “A Psalm of Life” to music, he knew that the poet was not talking about actual weeping numbers in the first line, perhaps a number 7 with tears dripping from the end of the top bar. No. Here the word “number” means a piece, selection, or verse. When we refer to the songs in a Broadway show, for instance, we often call them “number,.” as in “a showstopping song-and-dance number.” Therefore, if we piece together the title, “A Psalm of Life,” the subtitle, “What the heart of the young man said to the Psalmist,” and the first two lines (“Tell me not in mournful numbers/Life is but an empty dream”), we get a message of hope, optimism, and action.