‘Behold, the kingdom of God is within you!’ This was the creed of Nichiren also, witnessed by his life, confirmed by the Scripture, and supported by his metaphysical speculation. When he concentrated his thought on his own calling, he was in communion with the saints in the Lotus; when he expressed anxiety about his country, yet with confidence in its destiny, he was a prophet and an ideal patriot; when he reflected on his tranquil life among the mountains, he was almost a lyric poet, glorifying his surroundings by his religious vision; he was a scholastic philosopher when he interpreted the truths of existence and the nature of the religious community; and he was a mystic in his vision of the future realization of Buddhahood in himself and in the Kingdom of Buddha.
Nichiren, The Buddhist Prophet