SGI's Gosho collection is NOT an excellent compilation of Nichiren's writings.

"The Gosho Zenshu is NOT an excellent compilation of Nichiren's writings. NO ONE in any scholastic circles uses it because it is so sectarian and unreliable. It also recklessly mixes forged letters with authentic letters of Nichiren, so there is no way of knowing which is which. In fact, the Gosho Zenshu has a disclaimer in the preface, which says, "This collection includes virtually all the writings that have since of old been treated as Gosho, WHETHER THEIR AUTHENTICITY HAS BEEN CONFIRMED OR NOT."