How is the phrase "What is past is prolugue" translated into latin?

Question:

I understand Shakespeare said it, but it sounds like a latin phrase too. Any info on the quote would be great!

Best Answer - Chosen by Asker:

Quid praeteritum prologus est

Edit #1 - previous answer's "antea" is an adverb and translates "previously, formerly, before,in the past"