John Calvin, Institutes of the Christian Religion (1.11.8):
…man’s nature, so to speak, is a perpetual factory of idols.…Man’s mind, full as it is of pride and boldness, dares to imagine a god according to its own capacity; as it sluggishly plods, indeed is overwhelmed with the crassest ignorance, it conceives an unreality and an empty appearance as God.…
Daily experience teaches that flesh is always uneasy until it has obtained some figment like itself in which it may fondly find solace as in an image of God. In almost every age since the beginning of the world, men, in order that they might obey this blind desire, have set up symbols in which they believed God appeared before their bodily eyes.
Words of Grace 