It is difficult to paint the light, the various, the inconstant character of Gallienus, which he displayed… — Edward Gibbon
It is difficult to paint the light, the various, the inconstant character of Gallienus, which he displayed without constraint, as soon as he became sole possessor of the empire. In every art that he attempted, his lively genius enabled him to succeed; and as his genius was destitute of judgment, he attempted every art, except the important ones of war and government. He was a master of several curious, but useless sciences, a ready orator, an elegant poet, a skilful gardener, an excellent cook, and most contemptible prince... There were, however, a few short moments in the life of Gallienus, when, exasperated by some recent injury, he suddenly appeared the intrepid soldier and the cruel tyrant; till, satiated with blood, or fatigued by resistance, he insensibly sunk into the natural mildness and indolence of his character.
Source: Wikiquote · CC BY-SA 4.0
More from this book
Benevolence is the foundation of Justice, since we are forbidden to injure those we are bound to assist. A prophet may reveal the secrets of Heaven and futurity, but in his moral precepts he can only repeat the lessons of our own hearts.
To an active mind, indolence is more painful than labor ...
In the spirit of enthusiasm or vanity, the prophet [Muhammad] rests the truth of his mission on the merit of his book; audaciously challenges both men and angels to imitate the beauties of a single page; and presumes to assert that God alone could dictate this incomparable performance. This argument is most powerfully addressed to a devout Arabian, whose mind is attuned to faith and rapture; whose ear is delighted by the music of sounds; and whose ignorance is incapable of comparing the productions of human genius... If the composition of the Koran exceed the faculties of a man to what superior intelligence should we ascribe the Iliad of Homer, or the Philippics of Demosthenes?

