In
statibus variis civitatum, conscribuntur milites dissimillimis causis. Urgentur
barbari amore pugnandi; admoneantur cives reipublicæ liberæ animā pietatis; in
regno cives, at quidem nobiles, notione honoris animantur; sed incolas timidos
atque delicatos imperii labentis necesse est ad militiam aut prolicere spe
divitiarum aut compellere metu pœnæ.
In
the various states of society, armies are recruited from very different
motives. Barbarians are urged by the love of war; the citizens of a free
republic may be prompted by a principle of duty; the subjects, or at least the
nobles, of a monarchy, are animated by a sentiment of honor; but the timid and
luxurious inhabitants of a declining empire must be allured into the service by
the hopes of profit, or compelled by the dread of punishment.
—Edward Gibbon, De Lapsu et Ruina
Imperii Romanorum (The Decline and Fall
of the Roman Empire)