The Lotus Sūtra states that even the Buddha cannot measure the merit of those who put faith in even one character or sentence of the Lotus Sūtra. The Buddha has boundless wisdom; He can measure the amount of rain that has continued to fall for one or two weeks in the whole universe. Nevertheless, He cannot measure the merit of those who chant just one character or phrase of the Lotus Sūtra. How can we, sinners and the ignorant, measure this merit?
Regardless, very few people believe in the Lotus Sūtra, which is worthy of such great merit.
Gassui Gasho, A Letter on Menstruation, Nyonin Gosho