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;

therefore those persons are mere guessers who are anxious to contemplate the uncreated God through the medium of the things which he created, acting like those persons who seek to ascertain the nature of the unit through the number two, when they ought, on the other hand, to employ the investigation of the unit itself to ascertain the nature of the number two; for the unit is the first principle. But these men have arrived at the real truth, who form their ideas of God from God, of light from light.