He went with Mommsen in adoration of Caesar, and in depreciation of Cicero.

That Cicero used one sort of language in public speeches, and another sort in private correspondence, is true, and is notorious because some of his most intimate letters have been preserved.

But it is not peculiar to him.

The man who talked in public as he talked in private would have small sense of fitness.

The man who talked in private as he talked in public would have small sense of humour.