Letters 83.25

Mark Antony was a great man, a man of distinguished ability; but what ruined him and drove him into foreign habits and un-Roman vices, if it was not drunkenness and—no less potent than wine—love of Cleopatra? This it was that made him an enemy of the state; this it was that rendered him no match for his enemies; this it was that made him cruel, when as he sat at table the heads of the leaders of the state were brought in; when amid the most elaborate feasts and royal luxury he would identify the faces and hands of men whom he had proscribed; when, though heavy with wine, he yet thirsted for blood. It was intolerable that he was getting drunk while he did such things; how much more intolerable that he did these things while actually drunk!

Seneca, Letters to Lucilius 83.25, translated by Richard Mott Gummere