God has appointed duties for every man. He has given each man a calling in life. John Calvin believed that diligent pursuit of this calling is foundational for living a balanced life before God.
“It is enough if we know that the Lord’s calling is in everything the beginning and foundation of well-doing. And if there is anyone who will not direct himself to it, he will never hold to the straight path in his duties. Perhaps, sometimes, he could contrive something laudable in appearance; but whatever it may be in the eyes of men, it will be rejected before God’s throne. Besides, there will be no harmony among the several parts of his life. Accordingly, your life will then be best ordered when it is directed to this goal. For no one, impelled by his own rashness, will attempt more than his calling will permit, because he will know that it is not lawful to exceed its bounds. A man of obscure station will lead a private life ungrudigingly so as not to leave the rank in which he has been placed by God. Again, it will be no slight relief from cares, labors, troubles, and other burdens for a man to know that God is his guide in all these things. The magistrate will discharge his functions more willingly; the head of the household will confine himself to his duty; each man will bear and swallow the discomforts, vexations, weariness, and anxieties in his way of life, when he has been persuaded that the burden was laid upon him by God. From this will arise also a singular consolation: that no task will be so sordid and base, provided you obey your calling in it, that it will not shine and be reckoned very precious in God’s sight.” – Institutes 3.10.6