"We all know that light travels faster than the speed sound...

This is why certain people appear bright, until you hear them speak." Albert Einstein

In conclusion, a precursor with an anonymous ascription appeared in a newspaper column in 1959. A close match appeared in a newsletter by 1989. It was probably crafted by Gary Apple or Robert Orben who were editors of the newsletter. The attribution to Albert Einstein is unsupported.

I stand corrected, thank you. Nonetheless, I love the quote regardless of who said it.

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DeWayfarer · 61-69, M

Not Einstein. That quote was someone else in 1989. FYI Einstein past away in 1955.

This is the original quote from 1959.

https://quoteinvestigator.com/2019/09/06/light-sound/

A precursor appeared in Earl Wilson’s popular gossip column in 1959. The attribution was anonymous. Boldface added to excerpts by QI:[1]

EARL’S PEARLS: Someone described a second-rate singer: “Luckily light travels faster than sound — because she looks better than she sounds.”

Pfuzylogic · M

@DeWayfarer
That makes more sense.
I have never seen Einstein cut anyone down in past quotes. He seemed very respectful.