One character in sūtras other than the Lotus Sūtra, or name of Buddhas other than the Original Śākyamuni Buddha, is like a drop of river water, or a stone in the mountains or ocean. Unlike a drop of sea water, a drop of river water does not contain the water of numerous rivers, and a stone in the mountains or ocean doesn’t have the merit of numerous stones. However, … the Lotus Sūtra has innumerable merits; therefore, you may freely chant any of its chapters.

Gassui Gasho, A Letter on Menstruation, Nyonin Gosho, Letters Addressed to Female Followers, Page 28