"...the Christian will not overlook inferior causes. For, while he regards those by whom he is benefited as ministers of the divine goodness, he will not, therefore, pass them by, as if their kindness deserved no gratitude, but feeling sincerely obliged to them, will willingly confess the obligation, and endeavor, according to his ability, to return it. In fine, in the blessings which he receives, he will revere and extol God as the principal author, but will also honor men as his ministers, and perceive, as is the truth, that by the will of God he is under obligation to those, by whose hand God has been please to show him kindness."
-- John Calvin, Institutes of the Christian Religion, Book 1, Ch. 17.