The “mutual possession of ten realms” doctrine is as difficult to maintain as it is to see fire in a rock or flowers in wood. However it is not totally impossible because rocks spark when struck together and a tree blooms in spring. It is most difficult to believe that the realm of Buddhas is contained in the realm of humans because it is like saying that fire is in water or water in fire.
Nichiren wrote this in his treatise on Spiritual Contemplation and the Most Venerable (Kanjin Honzon-Shō). “Mutual Expression of Ten Realms” is one of the more difficult ideas from the Chinese Master T’ien-t’ai. Nichiren uses it to illustrate what the Buddha teaches in the Lotus Sūtra: that Buddha nature is contained within all beings. Even though this idea is difficult, we can see it in the transformations of everyday objects we encounter: rocks, fire, flowers and trees. With his similes, Nichiren reminds us that with the Lotus Sūtra as our guide, we can see the Buddha Dharma in all aspects of our lives.
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