Demosthenes

Philip, too, made more account of him than of any other popular leader at Athens, and it was admitted even by those who hated him that they had to contend with a man of mark. For both Aeschines and Hypereides say thus much for him while denouncing him.

Wherefore I do not know how it occurred to Theopompus to say that Demosthenes was unstable in his character and unable to remain true for any length of time to the same policies or the same men. For it is apparent that after he had at the outset adopted a party and a line of policy in the conduct of the city’s affairs, he maintained this to the end, and not only did not change his position while he lived, but actually gave up his life that he might not change it.