Marcus Tullius Cicero,
Letters to Atticus — 2.3 (XXVIII)
“ For if sight resulted from the impact of images, [5] the images would be in great difficulties with a narrow entrance: but, as it is, that "effusion" of rays gets on quite nicely. If you have any other fault to find you won't get off without an answer, unless it is something that can be put right without expense. ”
