P. Vergilius Maro, Aenid VI, 851-853
... You, Roman, be sure to rule the world (be these your arts), to crown peace with justice, to spare the vanquished and to crush the proud....
from: Virgil, Eclogues, Georgics, Aenid I-VI, with an English Translation by H. Rushton Fairclough, revised by G.P. Goold, London – Cambridge (Massachusetts), William Heinemann Ltd – Harvard University Press, 1999 (The Loeb Classical Library)