首楞嚴義疏注經 1.72

1.72

此云空生，或云善吉、善現等，生時家中庫藏器皿皆空故。相者謂言：「兒必善吉，此善吉相現於器故。」從是得名。於大眾中解空第一，入無諍定，喜說空法，所修行業以空為本。如下經云「我曠劫來心得無礙，初在母胎即知空寂，如是乃至十方成空，亦令眾生證得空性，蒙如來發性覺真空，空性圓明，得阿羅漢。」

Translated here as "Empty-Born," or as "Good Luck," "Good Appearance," and so forth, because at the time of his birth the treasury storerooms and vessels in his home were all empty. A physiognomist said: "The child will surely be of good auspiciousness, for this good and auspicious mark appears in the vessels." From this he obtained his name. Among the great assembly, he was foremost in understanding emptiness, entering the samādhi of non-contention (araṇā-samādhi), delighting in speaking on the Dharma of emptiness, with all his cultivated practices taking emptiness as the root. As the sūtra says below: "From vast kalpas past, my mind attained freedom from obstruction; first while within my mother's womb I already knew emptiness and quiescence, and thus up to the ten directions becoming empty, also causing sentient beings to realize and attain the nature of emptiness; receiving from the Tathāgata the disclosure of the true emptiness of the enlightened nature, with the nature of emptiness perfectly luminous, I attained the state of an arhat."