How we cite our quotes: (Line)
Quote #4
First and last being long, middle short, Amphimacer
Strikes his thundering hoofs like a proud high-bred Racer. (9-10)
The image of a "high-bred Racer" totally fits the amphimacer. Like a "thundering" "racer," the lines themselves "race" – and loudly. Line 9, for example, doesn't even bother with real verbs. The speaker just says "middle short" and "first and last being long" rather than, say, "the middle is short" or "the first and last are long."
Quote #5
If Derwent be innocent, steady, and wise,
And delight in the things of earth, water, and skies; (11-12)
The speaker says the future poet, his son Derwent, must be a lot of things; the emphasis on "delight" in particular is important. The poet cannot just "like" nature or "enjoy" it. He must "delight" in it, which suggests something more joyous than any old pleasure.