"The sutra states, “The wisdom of the Buddhas is infinitely profound and immeasurable.” [...] What is meant by this “wisdom”? It is the entity of the true aspect of all phenomena, and of the ten factors of life that lead all beings to Buddhahood. What then is that entity? It is Nam-myoho-renge-kyo. A commentary states that the profound principle of the true aspect is the originally inherent Myoho-renge-kyo. We learn that that true aspect of all phenomena is also the two Buddhas Shakyamuni and Many Treasures [seated together in the treasure tower]. “All phenomena” corresponds to Many Treasures, and “the true aspect” corresponds to Shakyamuni. These are also the two elements of reality and wisdom. Many Treasures is reality; Shakyamuni is wisdom. It is the enlightenment that reality and wisdom are two, and yet they are not two. These are teachings of prime importance. These are also what is called “earthly desires are enlightenment,” and “the sufferings of birth and death are nirvana.”"
From Gosho "Earthly Desires Are Enlightenment" (The Writings of Nichiren Daishonin Volume I, page 317-318)
From Gosho "Earthly Desires Are Enlightenment" (The Writings of Nichiren Daishonin Volume I, page 317-318)