A poem should be read several times in order to "hear" it and feel it's emotions. Part of discovering a poem, it's meaning, it's power, is to look at its parts. Though some parts will have more strength than others, each aspect of a poem contributed to its overall meaning of the prom and effect on the reader. There are a range of other poetic techniques that poets can use to contribute to the overall effect of the poem. Hope this helped! <3