Philo Judaeus De Praemiis Et Poenis Et De Exsecrationibus 45

[45] And how this impression was made, it is worth while to see by the observation of some similitude. Take this sun, which is perceptible by our outward senses, do we see it by any other means than by the aid of the sun? And do we see the stars by any other light than that of the stars? And, in short, is not all light seen in consequence of light? And in the same manner God, being his own light, is perceived by himself alone, nothing and no other being co-operating with or assisting him, or being at all able to contribute to the pure comprehension of his existence;