But you, Roman, remember, rule with all your power
the peoples of the earth — these will be your arts:
to put your stamp on the works and ways of peace,
to spare the defeated, break the proud in war.

[Tu regere imperio populos, Romane, memento
(Hae tibi erunt artes), pacique imponere morem,
Parcere subjectis et debellare superbos.]

Virgil (70-19 BC) Roman poet [b. Publius Vergilius Maro; also Vergil]

The Aeneid [Ænē̆is], Book 6, l. 851ff (6.851-53) [Anchises] (29-19 BC) [tr. Fagles (2006), l. 981ff]
    (Source)

Comparing the Roman "arts" to the arts at which other nations excel (metalwork, sculpture, oratory, astronomy).

(Source (Latin)). Alternate translations:

Be thou ambitious how to govern best,
In these arts, Roman, thou must be profest.
That we a peace well grounded may injoy,
Subjects to spare, and Rebels to destroy.
[tr. Ogilby (1649)]

But, Rome, 'tis thine alone, with awful sway,
To rule mankind, and make the world obey,
Disposing peace and war by thy own majestic way;
To tame the proud, the fetter'd slave to free:
These are imperial arts, and worthy thee.
[tr. Dryden (1697)]

To rule the nations with imperial sway be thy care, O Romans: these shall be thy arts; to impose terms of peace, to spare the humbled, and crush the proud.
[tr. Davidson/Buckley (1854)]

But ye, my Romans, still control
⁠The nations far and wide:
Be this your genius -- to impose
The rule of peace on vanquished foes,
Show pity to the humbled soul,
⁠And crush the sons of pride
[tr. Conington (1866)]

But thou, O Roman, bend thy mind to rule
With strength thy people. This shall be thy art;
And to impose the terms and rules of peace;
To spare the vanquished, and subdue the proud.
[tr. Cranch (1872), l. 1069ff]

Be thy charge, O Roman, to rule the nations in thine empire; this shall be thine art, to lay down the law of peace, to be merciful to the conquered and beat the haughty down.
[tr. Mackail (1885)]

But thou, O Roman, look to it the folks of earth to sway;
For this shall be thine handicraft, peace on the world to lay,
To spare the weak, to wear the proud by constant weight of war.
[tr. Morris (1900), l. 850ff]

Thou, Roman, rule, and o'er the world proclaim
The ways of peace. Be these thy victories,
To spare the vanquished and the proud to tame.
These are imperial arts, and worthy of thy name.
[tr. Taylor (1907), st. 114, l. 1023ff.]

But thou, O Roman, learn with sovereign sway
To rule the nations. Thy great art shall be
To keep the world in lasting peace, to spare
humbled foe, and crush to earth the proud.
[tr. Williams (1910)]

Remember thou, O Roman, to rule the nations with thy sway -- these shall be thine arts -- to crown Peace with Law, to spare the humbled, and to tame in war the proud!
[tr. Fairclough (1916)]

Remember, Roman,
To rule the people under law, to establish
The way of peace, to battle down the haughty,
To spare the meek. Our fine arts, these, forever.
[tr. Humphries (1951)]

But, Romans, never forget that government is your medium!
Be this your art: -- to practise men in the habit of peace,
Generosity to the conquered, and firmness against aggressors.
[tr. Day-Lewis (1952)]

But yours will be the rulership of nations,
remember, Roman, these will be your arts:
to teach the ways of peace to those you conquer,
to spare defeated peoples, tame the proud.
[tr. Mandelbaum (1971), l. 1134ff]

Roman, remember by your strength to rule
Earth's peoples -- for your arts are to be these:
To pacify, to impose the rule of law,
To spare the conquered, battle down the proud.
[tr. Fitzgerald (1981), l. 1151ff]

Your task, Roman, and do not forget it, will be to govern the peoples of the world in your empire. These will be your arts -- and to impose a settle pattern upon peace, to pardon the defeated and war down the proud.
[tr. West (1990)]

Remember, Roman, it is for you to rule the nations with your power,
(that will be your skill) to crown peace with law,
to spare the conquered, and subdue the proud.
[tr. Kline (2002)]

Your mission, Roman, is to rule the world.
These will be your arts: to establish peace,
To spare the humbled, and to conquer the proud.
[tr. Lombardo (2005), l. 1012ff]

Roman, remember that your arts are to rule
The nations with your empire, to enforce the custom of peace,
To spare the conquered and to subjugate the proud.
[tr. @sentantiq (2018)]

You, Roman, remember your own arts: to rule the world with law, impose your ways on peace, grant the conquered clemency, and crush the proud in war.
[tr. Bartsch (2021)]

See also Bob Dylan, "Lonesome Day Blues", Love and Theft (2001):

I'm gonna spare the defeated --
I'm gonna speak to the crowd.
I'm gonna spare the defeated, boys,
I'm going to speak to the crowd.
I am goin' to teach peace to the conquered,
I'm gonna tame the proud.