[4] A major focus of the Móhē zhǐguān is the practice of samatha (止 zhǐ, calming or stabilizing meditation) and vipassana (觀 guān, clear seeing or insight).
Zhiyi teaches two types of zhiguan - in sitting meditation and responding to objects following conditions or practicing mindfully in daily life.
[6] In the fifth volume of this treatise, Zhiyi reveals the doctrine of "three thousand realms in a single life-moment" (ichinen sanzen), which is considered to be the essence of his teachings.
Zhiyi divides his meditation system into three major sets, the "twenty-five skillful devices", the "Four samādhis" (Chinese: 四種三昧; pinyin: sizhǒng sānmèi) and the "ten modes of contemplation".
[8] This "round and inter-inclusive" truth is made up of emptiness, conventional existence, and the middle way between the first two, a simultaneous and integral affirmation of both.