a violence from within that protects us from a violence without

The poet refuses to allow his task to be set for him. He denies that he has a task and considers that the organization of materia poetica is a contradiction in terms. Yet the imagination gives to everything that it touches a peculiarity, and it seems to me that the peculiarity of the imagination is nobility, of which there are many degrees. This inherent nobility is the natural source of another, which our extremely head-strong generation regards as false and decadent. I mean that nobility which is our spiritual height and depth; and while I know how difficult it is to express it, nevertheless I am bound to give a sense of it. Nothing could be more evasive and inaccessible. Nothing distorts itself and seeks disguise more quickly. There is a shame of disclosing it and in its definite presentations a horror of it. But there it is. The fact that it is there is what makes it possible to invite to the reading and writing of poetry men of intelligence and desire for life. I am not thinking of the ethical or the sonorous or at all of the manner of it. The manner of it is, in fact, its difficulty, which each man must feel each day differently, for himself.

...

It is hard to think of a thing more out of time than nobility. Looked at plainly it seems false and dead and ugly. To look at it at all makes us realize sharply that in our present, in the presence of our reality, the past looks false and is, therefore, dead and is, therefore, ugly; and we turn away from it as from something repulsive and particularly from the characteristic that it has a way of assuming: something that was noble in its day, grandeur that was, the rhetorical once. But as a wave is a force and not the water of which it is composed, which is never the same, so nobility is a force and not the manifestations of which it is composed, which are never the same. Possibly this description of it as a force will do more than anything else I can have said about it to reconcile you to it. It is not an artifice that the mind has added to human nature. The mind has added nothing to human nature. It is a violence from within that protects us from a violence without. It is the imagination pressing back against the pressure of reality. It seems, in the last analysis, to have something to do with our self-preservation; and that, no doubt, is why the expression of it, the sound of its words, helps us to live our lives.

- Wallace Stevens, from his essay "The Noble Rider and the Sound of Words". You can read the whole thing here (starting on page 87).