Quotation marks are rarely needed for common expressions, says Chicago Manual of Style 16 (7.57). The only time we need to use them might be for phrases borrowed verbatim from another context (environment, setting) or for terms used ironically.

Do you use quotation marks for sayings?

We use quotation marks to show (or mark) the beginning and end of a word or phrase that is somehow special or comes from outside the text that we are writing. Quotation marks are also called "quotes" or "inverted commas". ...

Why do you put quotation marks around a phrase?

Use quotation marks to distance yourself from a word or phrase or to show that you are using it ironically. Place single quotation marks around a word or phrase which you are talking about.