A good marriage, if there are such, rejects the company and conditions of love; it strives to show forth those of friendship. It is a calm fellowship of life, full of fidelity, of trust, and of an endless number of useful and substantial mutual duties and obligations.

[Un bon mariage, s’il en est, refuse la compagnie & conditions de l’amour : il tasche à representer celles de l’amitié. C’est une douce societé de vie, pleine de constance, de fiance, & d’un nombre infiny d’utiles & solides offices, & obligations mutuelles.]

Michel de Montaigne (1533-1592) French essayist

Essays, Book 3, ch. 5 (3.5), “Of Some Verses of Virgil [Sur des vers de Virgile]” (1586) [tr. Ives (1925)]
    (Source)

This essay (and passage) first appeared in the 2nd (1588) edition.

(Source (French)). Alternate translations:

A good marriage (if any there be) refuseth the company and conditions of love; it endevoureth to present those of amity. It is a sweete society of life, full of constancie, of trust, and an infinite number of profitable and solid offices, and mutuall obligations.
[tr. Florio (1603)]

A good Marriage, if it be really so, rejects the Company and Conditions of Love and tries to represent those of Friendship. 'Tis a sweet Society of Life, full of Constancy, Trust, and an infinite Number of useful and solid Offices and mutual Obligations.
[tr. Cotton (1686)]

A good marriage, if there be any such, rejects the company and conditions of love, and tries to represent those of friendship. ’Tis a sweet society of life, full of constancy, trust, and an infinite number of useful and solid services and mutual obligations.
[tr. Cotton/Hazlitt (1877)]

A good marriage, if there is such a thing, rejects the company and conditions of love. It tries to imitate those of friendship. It is a sweet bond of life, full of constancy, of trust, and of an infinite nuimber of useful and substantial services and mutual obligations.
[tr. Zeitlin (1934)]

A good marriage, if such there be, rejects the company and conditions of love. It tries to reproduce those of friendship. It is a sweet association in life, full of constancy, trust, and an infinite number of useful and solid services and mutual obligations.
[tr. Frame (1943)]

A good marriage (if there be such a thing) rejects the company and conditions of Cupid: it strives to reproduce those of loving-friendship. It is a pleasant fellowship for life, full of constancy, trust and an infinity of solid useful services and mutual duties.
[tr. Screech (1987)]