“If we ask a vague question, such as, 'What is poetry?' we expect a vague answer, such as, 'Poetry is the music of words, ' or 'Poetry is the linguistic correction of disorder.'”
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Even if you walk exactly the same route each time - as with a sonnet - the events along the route cannot be imagined to be the same from day to day, as the poet's health, sight, his anticipations, moods, fears, thoughts cannot be the same.
Besides the actual reading in class of many poems, I would suggest you do two things: first, while teaching everything you can and keeping free of it, teach that poetry is a mode of discourse that differs from logical exposition.
The poet exposes himself to the risk. All that has been said about poetry, all that he has learned about poetry, is only a partial assurance.
Probably all the attention to poetry results in some value, though the attention is more often directed to lesser than to greater values.