De Plantatione

And the same assertion holds good also with respect to all the other powers which exist in us, or very nearly so; for, as they say, that no water was found in the well which had been mentioned, so also neither was there the faculty of seeing in the eyes, or that of hearing in the ears, or that of smelling in the nostrils, or, in short, any one of the senses in its corresponding organ; and similarly in the mind, there was not the faculty of comprehension.