Tacitus: Histories, IV 74f.

Speech of the Roman general Petillius Cerialis made before the Roman citizens (though of Gallic descent) of Trier (Germany) in the year CE 69. The speech was delivered at a time when they were contemplating joining a revolt from Rome. He begins by reminding the Gauls that the Romans entered Gaul at their [the Gauls] request and continued to protect the Gauls from the expanding German tribes across the Rhine.

"Gaul always had its pety kingdoms and intestine wars, till you submitted to Rome's authority. We, though so often provoked, have used the right of conquest to burden you only with the cost of maintaining peace. For the tranquillity of nations cannot be preserved without armies; armies cannot exist without pay; pay cannot be furnished without taxes; all else is common between us. You often command our legions. You govern these and other provinces. There is no privilege, no exclusion…Should the Romans be driven out (may the gods forbid!) what can result but wars between yourselves and other nations?"

and Tacitus's observations on the administrative strategy of the Roman governor, Agricola

To pacify the warlike Britons, to put an end to local wars and make them governable, Agricola "...gave private encouragement and public aid to the building of temples, courts of justice and dwelling-houses, praising the energetic, and reproving the indolent. Thus an honorable rivalry took the place of compulsion. He likewise provided a liberal education for the sons of the chiefs, and showed such preference for the natural powers of the Birtons over the industry of the [Romanized] Gauls that they who lately disdained the Latin language, now coveted its eloquence."