Caesaris, Caesari!

...Caesaris, Caesari: ...Dei, Deo!

That is how you would say the "Render unto Caesar..." of tomorrow's Sunday Gospel, in the language of the Church.

As in English the Latin has an attractive and memorable rythmic ring, not to mention economy of words (the rest of the phrase being implicit: Reddite ergo quae sunt Caesaris, Caesari: et quae sunt Dei, Deo). Matthew 22: 21