In an evening talk, Dogen said,

Students of the Way, it goes without saying that you must consider the inevitability of death. Even if you don’t consider this right now, you should be resolved not to waste time and refrain from doing meaningless things. You should spend your time carrying out what is worth doing. Among the things you should do what is the most important? You must understand that all deeds other than those of the buddhas and patriarchs are useless.