And all that he wrote was after some fashion about himself.

His letters, like all letters, are personal to himself.

His speeches are words coming out of his own mouth about affairs in which he was personally engaged and interested.

His rhetoric consists of lessons given by himself about his own art, founded on his own experience, and on his own observation of others.

His so-called philosophy gives us the workings of his own mind.
No one has ever told the world so much about another person as Cicero has told the world about Cicero.