There are ten realms in the human mind: Hell, Gaki, Animal, Ashura, Human, Ninten, Sravaka, Pratyekabuddha, Bodhisattva, and Buddha. Hell means having a hellish mind, filled with things such as hatred and suffering. Gaki means having an ignorant mind, an ego, and selfishness. Animal means being driven by instinctive desire, as an animal is. Ashura means anger, jealousy, and combat. Human being means love, sadness, and regret. Ninten means joy and happiness. Sravaka means sympathy. Pratyekabuddha means emptiness. Bodhisattva means patience and unconditional love. Buddha means compassion and wisdom. Our human mind is always moving throughout the ten realms as a result of stimulation, or the situations we are in. … Even if your mind changes constantly, there is a level or realm that you will occupy most often. That realm is your level of enlightenment so far. This teaching is called Ichinen Sanzen or “One Thought Contains Three Thousand Worlds,” which is the central core of the doctrine of the Lotus Sutra. This shows us a handy principle of enlightenment.