From Barchester Towers, by Anthony Trollope:
Wise people, when they find they are in the wrong, always put themselves right by finding fault with the people against whom they have sinned. Lady DeCourcy was a wise woman; and therefore, having treated Miss Thorne very badly by staying away till three o'clock, she assumed the offensive and attacked Mr. Thorne's roads. Her daughter, not less wise, attacked Miss Thorne's early hours. The art of doing this is among the most precious of those usually cultivated by persons who know how to live. There is no withstanding it. Who can go systematically to work, and having done battle with the primary accusation and settled that, then bring forward a counter-charge and support that also? Life is not long enough for such labours. A man in the right relies easily on his rectitude, and therefore goes about unarmed. His very strength is his weakness. A man in the wrong knows that he must look to his weapons; his very weakness is his strength. The one is never prepared for combat, the other is always ready. Therefore it is that in this world the man that is in the wrong almost invariably conquers the man that is in the right, and invariably despises him.