[dr_lew]

Where did I see it? ... “It’s important to learn from our mistakes so that we can recognize them when we make them again.” ... probably a Cryptoquote.

[grey_whiskers]

I believe the actual phrase was,

"ZI’Y ZFWTGIQUI IT KAQGU EGTF TSG FZYIQOAY YT INQI BA RQU GARTLUZVA INAF BNAU BA FQOA INAF QLQZU.".

Cheers!