There is a very old Japanese book, not ancient by Zen standards, only a few hundred years old, called Hagakure. Hagakure means Fallen Leaves. It is a collection of ideas and thoughts by and about samurai, an inspirational and motivational manual, if you will. I don’t know whether "fallen leaves" is meant to refer to the fallen samurai ancestors, or to the inspirational words and phrases scattered like so many leaves among the students of Bushido, The Way of the Sword; no matter, it is wonderful reading and its thoughts apply equally to students of The Way of Zen.