摩訶止觀 2.128

2.128

旨歸者，文旨所趣也。如水流趣海、火炎向空；識密達遠無所稽滯。譬如智臣解王密語；聞有所說皆悉了知，到一切智地。得此意者，即解旨歸。「旨」者，自向三德；「歸」者，引他同入三德，故名「旨歸」。又自入三德名「歸」；令他入三德名「旨」，故名「旨歸」。

The 'ultimate destination' (zhigui) is that toward which the text and purport tend. Just as water flows toward the sea and fire flames upward into the sky, when one discerns the esoteric and penetrates the profound, there is no obstruction. It is like a wise minister understanding the king's cryptic words; hearing whatever is spoken, he completely understands it, reaching the stage of omniscience (sarvajñatā). One who attains this meaning understands the ultimate destination. 'Purport' (zhi) is directing oneself toward the three virtues; 'return' (gui) is leading others to enter the three virtues together; hence it is called 'ultimate destination' (zhigui). Furthermore, entering the three virtues oneself is called 'return'; causing others to enter the three virtues is called 'purport'; hence it is called 'ultimate destination.'