“He who makes it his rule to use this world as if he used it not, not only cuts off all gluttony in regard to meat and drink, and all effeminacy, ambition, pride, excessive shows and austerity, in regard to his table, his house, and his clothes, but removes every care and affection which might withdraw or hinder him from aspiring to the heavenly life, and cultivating the interest of his soul.
It was well said by Cato: Luxury causes great care, and produces great carelessness as to virtue; and it is an old proverb: Those who are much occupied with the care of the body, usually give little care to the soul. Therefore while the liberty of the Christian in external matters is not to be tied down to a strict rule, it is, however, subject to this law—he must indulge as little as possible; on the other hand, it must be his constant aims not only to curb luxury, but to cut off all show of superfluous abundance, and carefully beware of converting a help into an hinderance.
Another rule is, that those in narrow and slender circumstances should learn to bear their wants patiently, that they may not become immoderately desirous of things, the moderate use of which implies no small progress in the school of Christ. For in addition to the many other vices which accompany a longing for earthly good, he who is impatient under poverty almost always betrays the contrary disease in abundance. By this I mean, that he who is ashamed of a sordid garment will be vain-glorious of a splendid one; he who not contented with a slender, feels annoyed at the want of a more luxurious supper, will intemperately abuse his luxury if he obtains it; he who has a difficulty, and is dissatisfied in submitting to a private and humble condition, will be unable to refrain from pride if he attain to honour. Let it be the aim of all who have any unfeigned desire for piety to learn, after the example of the Apostle, “both to be full and to be hungry, both to abound and to suffer need,” (Phil. 4:12).
Scripture, moreover, has a third rule for modifying the use of earthly blessings. We have already adverted to it when considering the offices of charity. For it declares that they have all been given us by the kindness of God, and appointed for our use under the condition of being regarded as trusts, of which we must one day give account. We must, therefore, administer them as if we constantly heard the words sounding in our ears, “Give an account of your stewardship.” At the same time, let us remember by whom the account is to be taken—viz. by him who, while he so highly commends abstinence, sobriety, frugality, and moderation, abominates luxury, pride, ostentation, and vanity; who approves of no administration but that which is combined with charity, who with his own lips has already condemned all those pleasures which withdraw the heart from chastity and purity, or darken the intellect.”
John Calvin Institutes of the Christian Religion (trans. Henry Beveridge) Book III, chap. x, 4-5.