Poetry being the sign of that which all men desire, even though the desire be unconscious, intensity of life or completeness of experience, the universality of its appeal is a matter of course.
Poetry is the communication through words of certain experiences that can be communicated in no other way.
The musician - if he be a good one - finds his own perception prompted by the poet's perception, and he translates the expression of that perception from the terms of poetry into the terms of music.
To know anything of a poet but his poetry is, so far as the poetry is concerned, to know something that may be entertaining, even delightful, but is certainly inessential.
We recognise in the finished art, which is the result of these conditions, the best words in the best order - poetry and to put this essential poetry into different classes is impossible.