Sometimes it is better to remain silent and be thought a fool than to open your mouth and remove all doubt.

I just comment and let people decide for themselves.

Also...

Since light travels faster than sound, judging someone before you hear them out can cause you to miss out on lots of opportunities

Had this quote on a beer cozy ~20 years ago.

Don’t know if anyone did it before Albert Simonin but an oldie and a goodie either way:

« C'est parce que la vitesse de la lumière est supérieure à celle du son, que tant de gens paraissent brillants avant d'avoir l'air con. »

at least in terms of memorability, I've actually experienced the opposite more clearly. I'd hear something a little stupid from someone, and assume they were dumb, only to find that I not only find them smart, but also quite similar to me.

Takes one to know one!

He may have been the first. I heard a similar saying in the 1980s, and he died in 1980.