Nichiren Daishonin states in “All Phenomena are Contained in a Single Life-Moment”
Suppose this illiterate person, who cannot read, write, or understand even a single word, takes faith in and chants Nam-Myoho-Renge-Kyo. He first will gain the benefit of verbal action from among the three categories of action: thoughts, words and deeds. Once he gains benefits, he will definitely be able to receive the seed of Buddhahood into his heart and liberate himself from the sufferings of life and death.
文盲而不觉悟一字之人， 若致信奉唱者， 身口意三业中，先成就口业之功德也。