大方廣佛華嚴經疏 19.23

19.23

二釋名者，初有二義：一三種發心之初、二十住之初。發亦二義：一發起上求；二三德開發，能知三世佛智故、永斷一切疑網故、得如來一身無量身等故，在於信位久已研窮，至此位中豁然開悟，故得功齊果位攝德無邊，受斯稱矣。

Second, explaining the name: "initial" has two meanings: first, the beginning of the three kinds of generating the mind; second, the beginning of the ten abidings. "Generating" also has two meanings: first, initiating the aspiration to seek above; second, the unveiling of the three virtues, because of being able to know the wisdom of the Buddhas of the three times, because of forever severing all webs of doubt, and because of attaining the Tathāgata's single body and immeasurable bodies and so forth. Having long investigated and examined in the station of faith, when arriving at this station one is suddenly and completely enlightened; therefore, attaining merit equal to the station of the fruit and subsuming boundless virtues, it receives this designation.