Philo Judaeus De Decalogo 60

[60] for though, as it is owing to the soul that they live, and form designs, and do everything which is done in human life, they nevertheless have never been able to behold their soul with their eyes, nor would they be able if they were to strive with all imaginable eagerness, wishing to see it as the most beautiful possible of all images or appearances, from a sight of which they might, by a sort of comparison, derive a notion of the uncreated and everlasting God, who rules and guides the whole world in such a way as to secure its preservation, being himself invisible.