Edward Gibbon, The Decline and Fall of the Roman Empire Book I, Chp. III, Pt. II
“Titus Antoninus Pius has been justly denominated a second Numa. The same love of religion, justice, and peace, was the distinguishing characteristic of both princes. But the situation of the latter opened a much larger field for the exercise of those virtues. Numa could only prevent a few neighboring villages from plundering each other’s harvests. Antoninus diffused order and tranquillity over the greatest part of the earth. His reign is marked by the rare advantage of furnishing very few materials for history; which is, indeed, little more than the register of the crimes, follies, and misfortunes of mankind. In private life, he was an amiable, as well as a good man. The native simplicity of his virtue was a stranger to vanity or affectation. He enjoyed with moderation the conveniences of his fortune, and the innocent pleasures of society; 44 and the benevolence of his soul displayed itself in a cheerful serenity of temper.
The virtue of Marcus Aurelius Antoninus was of severer and more laborious kind. 45 It was the well-earned harvest of many a learned conference, of many a patient lecture, and many a midnight lucubration. At the age of twelve years he embraced the rigid system of the Stoics, which taught him to submit his body to his mind, his passions to his reason; to consider virtue as the only good, vice as the only evil, all things external as things indifferent. 46 His meditations, composed in the tumult of the camp, are still extant; and he even condescended to give lessons of philosophy, in a more public manner than was perhaps consistent with the modesty of sage, or the dignity of an emperor. 47 But his life was the noblest commentary on the precepts of Zeno. He was severe to himself, indulgent to the imperfections of others, just and beneficent to all mankind. He regretted that Avidius Cassius, who excited a rebellion in Syria, had disappointed him, by a voluntary death, 471 of the pleasure of converting an enemy into a friend;; and he justified the sincerity of that sentiment, by moderating the zeal of the senate against the adherents of the traitor. 48 War he detested, as the disgrace and calamity of human nature; 481 but when the necessity of a just defence called upon him to take up arms, he readily exposed his person to eight winter campaigns, on the frozen banks of the Danube, the severity of which was at last fatal to the weakness of his constitution. His memory was revered by a grateful posterity, and above a century after his death, many persons preserved the image of Marcus Antoninus among those of their household gods. 49“