Temet Nosce?

Know thyself?

Our wisdom, in so far as it ought to be deemed true and solid wisdom, consists almost entirely of two parts: the knowledge of God and of ourselves. But as these are connected together by many ties, it is not easy to determine which of the two precedes, and gives birth to the other. For, in the first place, no man can survey himself without forthwith turning his thoughts towards the God in whom he lives and moves; because it is perfectly obvious, that the endowments which we possess cannot possibly be from ourselves; nay, that our very being is nothing else than subsistence in God alone.
On the other hand, it is evident that man never attains to a true self-knowledge until he has previously contemplated the face of God, and come down after such contemplation to look into himself. . . . So long as we do not look beyond the earth, we are quite pleased with our own righteousness, wisdom, and virtue; we address ourselves in the most flattering terms, and seem only less than demigods. But should we once begin to raise our thoughts to God, and reflect what kind of Being he is, and how absolute the perfection of that righteousness, and wisdom, and virtue, to which, as a standard, we are bound to be conformed, what formerly delighted us by its false show of righteousness, will become polluted with the greatest iniquity; what strangely imposed upon us under the name of wisdom, will disgust by its extreme folly; and what presented the appearance of virtuous energy will be condemned as the most miserable impotence. [c]

[c] Institutes of Christian Religion, John Calvin, Eerdmans, 1963, Vol 1, p. 38-39.