The document discusses using Henry Wadsworth Longfellow's poem "The Arrow and the Song" to teach students about friendship. It explains that the poem depicts our positive and negative actions as arrows and songs, and how those actions can affect others even if we don't remember them. The author proposes using the poem to build character and address bullying issues, and incorporating it into math by having students track positive and negative interactions on a graph to show how they behave toward peers.