The dharma-nature in the sphere of delusion; i. e. 法性隨緣; 眞如隨緣 the dharma-nature, or bhūtatathatā, in its phenomenal character; the dharma-nature may be static or dynamic; when dynamic it may by environment either become sullied, producing the world of illusion, or remain unsullied, resulting in nirvāṇa. Static, it is likened to a smooth sea; dynamic, to its waves.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous