Philo Judaeus De Congressu Eruditionis Gratia 25

[25] And each of these has a different appearance and a different nature. For instance, of the two citizen wives, one is a most healthy and well established and peaceful motion, whom from the circumstances the historians called Leah: and the other resembles a whetstone and is called Rachel, in the pursuit of whom the mind, which is fond of labour and fond of exercises, is much sharpened and excited; and the name, being interpreted, means the "sight of profanation;" not because she sees profanely, but, on the contrary, because she thinks the things which are seen and which are the objects of the external senses, not brilliant but common and profane in comparison of the pure and untainted nature of those things which are invisible and which are only discernible by the intellect.