Both the Lotus Sutra and Zen Master Dogen are saying something very similar, that what we do matters and has an effect on those around us, perhaps beyond what we are willing or prepared to notice.
First you must believe that you are already within the Way. You must believe that you are free of delusion, illusory thoughts, confused ideas, increase, and decrease and mistaken understanding. Believe in this manner, clarify the Way and practice accordingly. This is the essence of studying the Way.
Sawaki Kodo Roshi, a 20th century Japanese Zen Master, talked about Zen as the “Study of loss.” What I like about this is how unappealing this sounds on the surface. In a culture that values unending growth and gain, who wants to study about loss? Kodo Roshi, in fact, says in Japanese, “Son wa toku, toku wa son” = “Loss is gain and gain is loss.”