Academic philosophy is mostly concerned with the Greeks and Germans. The Romans had their philosophers, but they did not have the same influence on modern thought.

Also, often times philosophers do use an original word or phrase because it cannot be translated well into English. Language evolves over time and concepts as they were originally understood can be lost or muddled by modern uses of a word used to substitute. Also, etymology is more and more important in philosophy.

Caaesar ad sum iam forte. Brutus adarat. Caesar sic in omnibus. Brutus sic in at.

Redde Caesari quae sunt Caesaris.