Idolatry as Evidence of the Knowledge of God

From Calvin’s Institutes [book 1, chapter 3]:

“No, even idolatry is ample evidence of this fact.  For we know how reluctant man is to lower himself, in order to set other creatures above him.  Therefore, when he chooses to worship wood and stone rather than be thought to have no God, it is evident how very strong this impression of a deity must be; since it is more difficult to obliterate it from the mind of man, than to break down the feelings of his nature–these certainly being broken down, when, in opposition to his natural haughtiness, he spontaneously humbles himself before the meanest object as an act of reverence to God.”