Sentence:  It is essential, as in Milton, that poetry be simple, sensuous, and <WSD>impassionate</WSD>:—simple that it may appeal to the elements and the primary laws of our nature; sensuous, since it is only by sensuous images that we can elicit truth at a flash; <WSD>impassionate</WSD> since images must be vivid, in order to move our passions and awake our affections. 
Meaning of the word marked with <WSD> tags:  filled with passion; impassioned