"If only closed minds came with closed mouths” is a saying that has been printed on many images.

“IF ONLY CLOSED MINDS CAME WITH CLOSED MOUTHS,” credited to Nicole Aitoro of New Rochelle, New York, was printed in Sassy magazine in 1993. “if only closed minds came with closed mouths.-nicole aitoro” was posted on the newsgroup k12.chat.senior on August 3, 1995. “If only closed minds came with closed mouths” (a bumper sticker suggestion) was printed in The Magee County Courier/Simpson County News (Magee, MS) on February 8, 2001. ”Latest bumper snicker As spotted along Interstate 70: ‘If only Closed Minds Came with Closed Mouths’“ was printed in The Pantagraph (Bloomington, IL) on November 5, 2002.


Google Books
Sassy
1993
Pg. ?: 
IF ONLY CLOSED MINDS CAME WITH CLOSED MOUTHS.
NICOLE AITORO,
NEW ROCHELLE, NY

Google Groups: rec.humor
*$%& you
mc...@ibm.net
Feb 21, 1995, 9:46:29 AM
(...)
> P.S. If only closed minds came with closed mouths.
>
> Asshole.

Google Groups: k12.chat.senior
There is nothing wrong with Gays
Mitch Hall
Aug 3, 1995, 3:00:00 AM
(...)
raven

if only closed minds came with closed mouths.
-nicole aitoro

Google Groups: rec.pets
Feeding Hedgehogs?
Rachel Goldberg and/or Adrian Gomez
Aug 11, 1995, 3:00:00 AM
(...)
Adrian Gomez, Rachel Goldberg, two cats, and a hedgehog
“If only closed minds came with closed mouths.”

Newspapers.com
8 February 2001, The Magee County Courier/Simpson County News (Magee, MS), “It’s My Turn” by Miriam May, pg. 4A, col. 5:
Need a new bumper sticker?
(...)
If only closed minds came with closed mouths.

Newspapers.com
5 November 2002, The Pantagraph (Bloomington, IL), Bill Flick column, pg. D1, col. 1:
Latest bumper snicker
As spotted along Interstate 70:
“If only Closed Minds
Came with Closed Mouths”

Twitter
Anna L. Creech, MLIS 🏳️‍🌈
@annacreech
Just remembered! Saw a bumper sticker yesterday that said, “If only closed minds came with closed mouths.” Nice!
10:33 AM · Jul 3, 2008·Twitter Web Client

Twitter
John Gillmartin
@jgillmartin
An Oldie but a Goodie - Wouldn’t it be great if closed minds came with closed mouths!
9:03 PM · Feb 27, 2009·Twitter Web Client

Twitter
Annora
@ongrara
“If only closed minds came with closed mouths.”
— Nicole Aitoro.
haha!oh so true =)
6:29 AM · Apr 30, 2010·Twitter Web Client

Twitter
Heartbroken bitch
@MAKEUP_SEX
if only closed minds came with closed mouths
2:42 PM · Dec 5, 2011·Twitter Web Client

Twitter
Chaise Candie
@ChaiseCandie
If only closed minds came with closed mouths.
11:08 PM · Oct 25, 2012·Hootsuite

Twitter
Chris Meloni
@Chris_Meloni
If only closed minds came with closed mouths… #food4thought
12:24 PM · Dec 21, 2013·Twitter for iPad

Reddit—Jokes
Posted by u/ektukroanondo October 25, 2014
If only closed minds came with closed mouths.

Google Books
If Only Closed Minds Came With Closed Mouths Journal
Blank Lined Journal; Funny Gag Gift
By Active Creative Journals · 2016

Reddit—LGBT
Posted by u/Beejaydel October 8, 2018
“If only closed minds came with closed mouths.”

Twitter
Prof. Feynman
@ProfFeynman
If only closed minds came with closed mouths. 🧠
11:48 PM · Jan 31, 2022·Twitter for Android