Philo Judaeus De Abrahamo 154

[154] but it is not in this particular alone that the beauty of the eyes exceeds the rest of the outward senses, but also because the use of the other senses is interrupted during our waking moments; for we must not include in our statement the inactivity which results from sleep; for they are at rest whenever there is not some external object to put them in motion; but the energies of the eyes when they are open are continuous and uninterrupted, as the eyes are never satiated or wearied, but continue to operate in accordance with the connection which they have with the soul;