“…the Lord enjoins every one of us, in all the actions of life, to have respect to our own calling. He knows the boiling restlessness of the human mind, the fickleness with which it is borne hither and thither, its eagerness to hold opposites at one time in its grasp, its ambition. Therefore, lest all things should be thrown into confusion by our folly and rashness, he has assigned distinct duties to each in the different modes of life. And that no one may presume to overstep his proper limits, he has distinguished the different modes of life by the name of callings. Every man’s mode of life, therefore, is a kind of station assigned him by the Lord, that he may not be always driven about at random. So necessary is this distinction, that all our actions are thereby estimated in his sight, and often in a very different way from that in which human reason or philosophy would estimate them. There is no more illustrious deed even among philosophers than to free one’s country from tyranny, and yet the private individual who stabs the tyrant is openly condemned by the voice of the heavenly Judge. But I am unwilling to dwell on particular examples; it is enough to know that in every thing the call of the Lord is the foundation and beginning of right action. He who does not act with reference to it will never, in the discharge of duty, keep the right path. He will sometimes be able, perhaps, to give the semblance of something laudable, but whatever it may be in the sight of man, it will be rejected before the throne of God; and besides, there will be no harmony in the different parts of his life. Hence, he only who directs his life to this end will have it properly framed; because free from the impulse of rashness, he will not attempt more than his calling justifies, knowing that it is unlawful to overleap the prescribed bounds. He who is obscure will not decline to cultivate a private life, that he may not desert the post at which God has placed him. Again, in all our cares, toils, annoyances, and other burdens, it will be no small alleviation to know that all these are under the superintendence of God. The magistrate will more willingly perform his office, and the father of a family confine himself to his proper sphere. Every one in his particular mode of life will, without repining, suffer its inconveniences, cares, uneasiness, and anxiety, persuaded that God has laid on the burden. This, too, will afford admirable consolation, that in following your proper calling, no work will be so mean and sordid as not to have a splendour and value in the eye of God.”
– John Calvin (1509-1564), Institutes of the Christian Religion, III.x.6.