智者千虑，必有一失。 현명한 사람은 많이 생각하면 많이 잃을 것입니다.

Probably in this context: Elbert Hubbard Quotes Every man is a damn fool for at least five minutes every day; wisdom consists in not exceeding the limit. It just means a wise person isn't a damn fool for more than 5 minutes a day. We all do and say stupid things in a day, a wise person tries to avoid/reduce this. It's English sarcasm.

A saying? Not that I've ever heard. . Meaning? Context?

Not that I've ever heard.

it(wisdom) just simply meaning knowledge/info/ about it or increase in the perception of any ones imagination. when suddly any ones thoughts become good (enriched) . incease in window is always a positive line .