Nichiren Daishonin states in “Opening of the Eyes”:
Although I, Nichiren, and my disciples may face various difficulties, we will naturally reach the world of Buddhahood, as long as we do not harbor doubts. Do not doubt that the heavens will protect you. Do not be discouraged because your life is not easy and secure in this lifetime. Though I have taught this to my disciples day and night, many of them, raising doubts, abandon their faith. Those with weak faith always forget what they have promised when the crucial moment comes.