首楞嚴義疏注經 9.69

9.69

'Trigger' is the tooth of a crossbow. 'Nock' is the notched end of an arrow where it receives the bowstring. Both are metaphors for the sole mind of equanimity. Giving rein to autonomy and roaming among the samāpattis, it is said to 'operate alone.' Not corresponding to discordant or concordant conditions, it is said to have 'no ground for mutual grinding.' This heaven cultivates dhyāna through the middling grade of mixed cultivation; the functioning of wisdom is clear and open, all free from the obstacles to concentration, gradually attaining coolness, so it is called 'No Heat.'