四徳 (Jpn shi-toku )
(1) Four noble qualities of a Buddha's life—eternity, happiness, true self, and purity. These describe the true nature of a Buddha's life, which is pure and eternal, and which manifests the true self and enjoys absolute happiness. Because ordinary people possess the Buddha nature, they too can develop the four virtues when they attain Buddhahood by fulfilling the Buddha's teachings.
(2) Four virtues of a wheel-turning king: great wealth, admirable features and form, freedom from worries, and long life.
The four Nirvanic virtues:
(1) Eternity or permanence;
These four important virtues are affirmed by the sutra in the transcendental or nirvana-realm.