If a person studies too much and exhausts his reflective powers he will be confused and will not be able to apprehend even that which had been within the power of his apprehension. For the powers of the body are all alike in this respect.

Learning never exhausts the mind.

So it is in poetry. All we ask is that the mood recorded shall impress us as having been of the kind that exhausts the imaginative capacity if it fails to do this the failure will announce itself either in prose or in insignificant verse.