Nichiren Daishonin states in “Opening of the Eyes”:
Although I, Nichiren, and my disciples may face various difficulties, we will attain Buddhahood as a matter of course, as long as we do not harbor doubts [about the teaching of the Lotus Sutra]. Do not doubt that the heavens will protect you. Do not be discouraged because you do not enjoy an easy and secure existence in this life. Though I have taught this to my disciples day and night, many of them, raising doubts, abandon their faith [in the Lotus Sutra]. Those with weak faith always forget what they have promised when the crucial moment comes.