...As to your P.S. If you have time to send me a longer list of your protean genera, I will say if they seem to be protean here. Of those you mention:--英文原著 · 《More Letters of Charles Darwin Volume I》
The poet could hardly have employed a more effective metaphor in which to embody the idea of mental swerving. The several monologues all going over the same ground, are artistically justified in their exhibiting, each of them, a quite distinct form of this swerving. For the ultimate purpose of the poet, it needed to be strongly emphasized. The student of the poem is amazed, long before he gets over all these monologues, at the Protean capabilities of the poet's own intellect. It takes all conceivable attitudes toward the case, and each seems to be a perfectly easy one.英文原著 · 《Introduction to Robert Browning》