Paradoxically, poetry is an expression of the fact that there are great things that are inexpressible. There is no one-to-one correspondence between the depths of human experience and the capacities of language to capture that experience. There are experiences that go beyond the ability of language to express them.
For the poet, this limitation of language does not produce silence; it produces poetry. Poetry is a kind of verbal resistance to the impenetrability of human experience. The poet will at least try. – j. piper