Nichiren Daishonin states in “Orally Transmitted Teachings”(“Ongi kuden”):
Ichinen sanzen (three thousand realms in a single life-moment) arises from the single character “faith”. The attainment of Buddhahood by all Buddhas of the three existences is also based on the single character “faith”. A sword that extirpates fundamental darkness is the single character “faith”. Believing and understanding with no doubts leads one to overcome fundamental darkness.