But justice commands us to have mercy upon all men, to consult the interests of the whole human race, to give to every one his due, and injure no sacred, public, or foreign rights, and to forbear touching what does not belong to us.

[Iustitia autem praecipit parcere omnibus, consulere generi hominum, suum cuique reddere, sacra, publica, aliena non tangere.]

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

De Re Publica [On the Republic, On the Commonwealth], Book 3, ch. 15 / sec. 24 (3.24) [Philus] (54-51 BC) [tr. Yonge (1853), ch. 12]
    (Source)

Contrasting the dictates of justice, vs the wisdom/prudence of conquest. Earlier sources arrange the fragments to make this ch. 12, as noted. (Source (Latin)). Alternate translations:

But justice orders us to spare all, to consult the welfare of mankind, to give to every one his own, and to abstain from every thing that is sacred, every thing that is public, every thing which is not our own.
[tr. Featherstonhaugh (1829), ch. 12]

But justice commands us to have mercy upon all men, to consult the interests of the whole human race, to give to every one his due, and injure no sacred, public, or foreign rights, and to forbear touching what does not belong to us.
[tr. Barham (1841), ch. 12]

Justice, on the other hand, instructs us to spare all men, to consider the interests of the whole human race, to give everyone his due, and not to touch the sacred or public property, or that which belongs to others.
[tr. Keyes (1928)]

Justice, on the other hand, teaches you to spare all men, to consider the interests of the human race, to render to each his own, and not to tamper with that which is sacred, that which is public, and that which belongs to another. [tr. Sabine/Smith (1929)]

Justice, on the other hand, teaches us to spare all men, take thought for the interests of mankind, give everyone his due, and not lay hands on the things belonging to the gods, the state, or somebody else.
[tr. Rudd (1998)]

Justice instructs us to spare everyone, to look after the interests of the human race, to render to each his own, to keep hands off things that are sacred or public or belong to someone else.
[tr. Zetzel (1999), ch. 24b]

But justice instructs [us] to spare everyone, to take care of the human race, to render to each his own, not to touch sacred things, public things, another's things.
[tr. Fott (2014)]