Comparison of Dion and Brutus

Moreover, the gravest charge which is brought against Brutus, namely, that although his life was spared by the kindness of Caesar, together with the lives of all the fellow captives for whom he wished to intercede, and although Caesar held him a friend and honoured him above many, he struck down his preserver with his own hand,—this charge no one can bring against Dion.

On the contrary, while he was a courtier and friend of Dionysius, he tried to set the state in order and help in preserving it; but when he had been banished from his country, wronged as a husband, and deprived of his property, he openly resorted to a war that was lawful and just. Or does this argument reverse itself at once?

For that which redounds to the praise of both men is their hostility to tyrants and hatred of their baseness, and this is disinterested and sincere in the case of Brutus, since without any private grievance against Caesar he risked his life for the common liberty;