This is the worst trait of minds rendered arrogant by prosperity, they hate those whom they have injured. - Seneca

Alexander, king of Macedon, began to study geometry; unhappy man, because he would thereby learn how puny was that earth of which he had seized but a fraction! Unhappy man, I repeat, because he was bound to understand that he was bearing a false title. For who can be “great” in that which is puny?

"Although," said he [Cato], "all the world has fallen under one man's sway, although Caesar's legions guard the land, his fleets the sea, and Caesar's troops beset the city gates, yet Cato has a way of escape; with one single hand he will open a wide path to freedom. This sword, unstained and blameless even in civil war, shall at last do good and noble service: the freedom which it could not give to his country it shall give to Cato!

Let me indicate here how men can prove that their words are their own: let them put their preaching into practice.