A lyric it is true is the expression of personal emotion but then so is all poetry and to suppose that there are several kinds of poetry differing from each other in essence is to be deceived by wholly artificial divisions which have no real being.
Poetry can't cure cancer but it can save your life until you die.
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Any long work in which poetry is persistent be it epic or drama or narrative is really a succession of separate poetic experiences governed into a related whole by an energy distinct from that which evoked them.