Demosthenes

For he was not like Demades, who apologised for his change of policy by saying that he often spoke at variance with himself, but never at variance with the interests of the city; nor like Melanopus, who, though opposed politically to Callistratus, was often bought over by him, and then would say to the people: The man is my enemy, it is true, but the interests of the city shall prevail;

nor like Nicodemus the Messenian, who first attached himself to Cassander and then again advocated the interests of Demetrius, but said that he was not contradicting himself, for it was always advantageous to listen to one’s masters. We cannot say such things of Demosthenes also, as of one who is turned from his course and veers to and fro either in word or deed-nay, he followed one unchangeable scale, as it were, and ever held to one key in politics.