Read it through once

First follow nature and your judgment frame By her just standard, which is still the same. Unerring nature still divinely bright, One clear, unchanged and universal light, Life force and beauty, must to all impart, At once the source and end and test of art Art from that fund each just supply provides, Works without show and without pomp presides In some fair body thus the informing soul With spirits feeds, with vigor fills the whole, Each motion guides and every nerve sustains, Itself unseen, but in the effects remains. Some, to whom Heaven in wit has been profuse, [80] Want as much more, to turn it to its use; For wit and judgment often are at strife, Though meant each other's aid, like man and wife. 'Tis more to guide, than spur the muse's steed, Restrain his fury, than provoke his speed, The winged courser, like a generous horse, [86] Shows most true mettle when you check his course.