The purpose of miracle, mystery, and morality plays was primarily to
entertain on holidays
provide instruction to the illiterate
undermine roman authority

The answer is: provide instruction for the illiterate.

Miracle or mystery plays can be said to be the antecedents of morality plays (the former being of biblical and religious topics and the latter being more secular but still speaking of morality). Both, with centuries separating them (miracle plays being earlier than morality plays), are forms of medieval plays which aimed at instructing the audience (and most people at that time were illiterate) on the ways of morality and the good life.

you need to post the passage so we know what you’re talking about

you wright a 3 paragraph on vincen van gogh's life using textual evidence from the biography as support for your claims.