Poetry is a witnessing to magnitude. It is the art of making urgent values manifest, and of imposing them on the reader. It is the housing of these values in poems so they will exist with maximum pressure, and for the longest time. It is the craft of doing so in structures that are a delight in themselves. And it is the mystery of fashioning poems in such a way that the form and the content are one.
- Jack Gilbert, The Landscape of American Poetry, 1965