“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.”
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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.
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.
Is it not careless to become too local when there are four hundred billion stars in our galaxy alone.
Everything is discursive opinion instead of direct experience.