1 “Putting some hard work into cultivation diligently” emphasizes two things: diligence and the ability to endure hardship. When it comes to diligence there is no time restriction. You do it whenever you have some free time or whenever you want to. Enduring hardship means that you will remain unwavering even with all kinds of physical pain or affliction.
2 Speaking of the physical challenges, although your body may be tired and you are getting sleepy, you need to pull yourself together. To do quiet sitting requires plenty of sleep. Quiet sitting must be practiced four times a day, especially when the weather is getting colder or hotter. This is what working hard is all about. You need to endure the challenges of cold and hot weather.
The Anthro-Celestial Research College, October 2, 1991