It is said in the Sūtra of Infinite Meaning (Muryōgi-kyō), an introductory teaching to the Lotus Sūtra: “Though unable to perform the six kinds of practice leading to Buddhahood— charity, observing precepts, perseverance, effort, meditation and wisdom— upholders of this sūtra will inevitably receive merits from practicing them.”
Kanjin Honzon-shō, A Treatise Revealing the Spiritual Contemplation and the Most Verable One, Writings of Nichiren Shōnin, Doctrine 2, Page 145