首楞嚴義疏注經 1.37

1.37

時成就也。師資合會，說聽究竟，總言一時。一者揀異餘時，時者隨世假立。如來說經有無量時，不能別舉，一言略周但言一時。《涅槃經》云「一時在恒河岸」等。又諸方時分延促不定，故但言一時。若約法義釋者，即說聽之時，心境泯、理智融，凡聖如、本始會，此諸二法皆一之時。

This is the fulfillment of time. Master and disciples assembling together, preaching and listening brought to completion, it is comprehensively called "at one time". "One" distinguishes it from other times; "time" is provisionally established in accordance with worldly conventions. The Tathāgata's preachings of sūtras had immeasurable times, which cannot be individually cited; with one word briefly encompassing all, it merely says "at one time". The Nirvāṇa Sūtra says: "At one time on the bank of the Ganges," and so forth. Furthermore, time divisions in the various quarters are long or short without uniformity; hence it merely says "at one time". If explained according to the Dharma-meaning, it is the time of preaching and listening when mind and object vanish, principle and wisdom fuse, ordinary and noble are identical (tathatā), and origin and inception unite—the time when all such pairs of dharmas are one.