De Decalogo
Philo Judaeus
The works of Philo Judaeus, the contemporary of Josephus, volume 3. Yonge, C. D., translator. London: Henry G. Bohn, 1855.
And something of the same kind appears to happen, also, with respect to the external senses; for very frequently the eyes, hastening to come to the comprehension of something which is removed to a great distance, strain themselves, exerting themselves to the very fullest extent of and even beyond their power, are unsuccessful, and grow dim in the empty space between themselves and their object, wholly failing in attaining to an accurate knowledge of the subject before them, and moreover impairing and injuring their sight by the exceeding intensity of their efforts and steady gaze.
And, again, sometimes when an indistinct noise is borne