Every man is bound to bear his own misfortunes rather than to get quit of them by wronging his neighbour.

[Suum cuique incommodum ferendum est potius quam de alterius commodis detrahendum.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

De Officiis [On Duties; On Moral Duty; The Offices], Book 3, ch. 5 (3.5) / sec. 30 (44 BC) [tr. Cockman (1699)]
    (Source)

(Source (Latin)). Alternate translation:

Every man ought to bear his own evils, rather than wrong another, by stripping him of his comforts.
[tr. McCartney (1798)]

It is rather the duty of each to bear his own misfortune, than wrongfully to take from the comforts of others.
[tr. Edmonds (1865)]

Each man must bear his own privations rather than take what belongs to another.
[tr. Peabody (1883)]

A man should bear his own misfortune rather than trench upon the good fortune of another.
[tr. Gardiner (1899)]

It is the duty of each man to bear his own discomforts, rather than diminish the comforts of his neighbor.
[ed. Harbottle (1906)]

Each one must bear his own burden of distress rather than rob a neighbour of his rights.
[tr. Miller (1913)]

Each man should endure his own suffering rather than reduce the benefits of another person.
[tr. Edinger (1974)]