Kokusekiryusui (刻石流水) means "to engrave kindness received on a stone in your heart, and let kindness given flow like water." It means not only to repay the kindness you receive from others, but also to extend that kindness to more people. And to forget the kindness you have given the moment you give it. Originally, this phrase comes from the Buddhist scripture "Kenjo Ryusui, Juon Kokuseki" (懸情流水 受恩刻石), which means "Let your affections flow like water, and engrave the kindness you receive on a stone." It's a profound concept. The above is from a word explanation article. I went temple-hopping the other day, and I was moved by the various instructive signs that were standing at the temple, so I wrote this.