Primroses; salutations; the miry skull of a half-eaten ram; vicious wounds in earth opening. What seraphs are afoot. - Geoffrey Hill

I think art has a right—not an obligation—to be difficult if it wishes. And, since people generally go on from this to talk about elitism versus democracy, I would add that genuinely difficult art is truly democratic.

I think intelligence has a kind of range of sense and allows us to contemplate the coexistence of the conceptual aspect of thought and the emotional aspect of thought as ideally wedded, troth-plight, and the circumstances in which this troth-plight can be effected are to be found in the medium of language itself.

The Mystery of the Charity of Charles Péguy,