A poem does invite, it does require. What does it invite? A poem invites you to feel. More than that: it invites you to respond. And better than that: a poem invites a total response.
This response is total, but it is reached through the emotions. A fine poem will seize your imagination intellectually — that is, when you reach it, you will reach it intellectually too — but the way is through emotion, through what we call feeling.

Chapter One : The Fear of Poetry, p. 8 - The Life of Poetry (1949)