don't knock it till you've tried it

English

(informal) One should not criticise or dismiss something before one has experienced it.
- 2014, Jamie Denton, Breaking the Rules‎^[1], Harlequin, →ISBN:
  Brenda snagged an extra peeler from the drawer and sat at the table with Jill. “I don't know why anyone would want to live in New York City.” “Don't knock it till you've tried it, Brenda,” Carly said, adding a dash of salt to the Waldorf salad.
- 2020, Jason Peters, The Culinary Plagiarist: (Mis)Adventures of a Lusty, Thieving, God-Fearing Gourmand‎^[2], Wipf and Stock, →ISBN:
  That's right: peanut butter. I'm not going to get enthusiastic like some off-Broadway choreographer expostulating on sexual preferences—“don't knock it till you've tried it!”—but don't knock it till you've tried it. The Smokey Bar! calls it the PBJ for reasons that have nothing to do with jelly.