By the time of Wordsworth it was a mere survival--a dead form remaining after its true function had entirely vanished.

The proposal to return to the language of common life was the natural revolt of one who desired poetry to be above all things the genuine expression of real emotion.

Yet it is, I think, impossible to maintain that the diction of poetry should be simply that of common life.
The true principle would rather seem to be that any style becomes bad when it dies; when it is used merely as a tradition, and not as the best mode of producing the desired impression; and when, therefore, it represents a rule imposed from without, and is not an expression of the spontaneous working of minds in which the corresponding impulse is thoroughly incarnated.

In such a case, no doubt, the diction becomes a burden, and a man is apt to fancy himself a poet because he is the slave of the external form instead of using it as the most familiar instrument.

By Wordsworth's time the Pope style was thus effete; what ought to be the dress of thought had become the rigid armour into which thought was forcibly compressed, and a revolt was inevitable.