Note 117 — AN ESSAY ON CRITICISM.
Reading edition
Pope took his imagery from Horace, Ars Poet., 361:
Ut pictura, poesis erit: quæ, si propiùs stes, Te capiat magis; et quædam, si longiùs abstes: Hæc amat obscurum; volet hæc sub luce videri.
He was also indebted to the translation of Boileau's Art of Poetry by Dryden and Soame:
Each object must be fixed in the due place, And diff'ring parts have corresponding grace.