(most) important point; key point; key; secret; essence
amazing truth; cardinal principle; key (to understanding)
threefold truth (all things are void; all things are temporary; all things are in the middle state between these two) (in Tendai)
truth of the way to the cessation of suffering
truth of the middle (all things are in a middle state, being void yet having temporary existence)
truth of emptiness (holding that all things are void)
truth of temporariness (holding that all things are temporary)