Nay, grains of corn themselves, an endless store,
Remain distinguishable, one and all;
Are known apart by learnéd in such lore.
Art works after one pattern, and by rule;
Nature as the mood inspires, not a school.
She is certain in idea; diverse
In embodiment; never same and dull.
Echo
Bk. IV. vv. 525-536, 549-596