The creator of Jeet Kune Do.
as recorded by Augustine Fong
"Kuen Kuit" is Cantonese for "martial sayings". Many sayings are common to different lineages of Wing Chun. "Loy Lau Hoi Sung, Lut Sau Jik Chung", meaning "retain what's coming in, send off what's retreating; rush in upon loss of hand contact" captures an essential strategy of the Wing Chun system, regardless of style.
- Originally at www.alphalink.com.au/~bundles/KeunKuit.htm (broken link, not archived)
I found a variation at https://www.wingchunnews.ca/maxims-of-wing-chun/