大般涅槃經義記 6.215

6.215

下佛答之，先對初句明己昔說，迦葉佛法七日滅者，小乘法滅，大乘不滅。「汝向所問迦葉如來有是經不」下，對前第二明迦葉佛實有不無。「迦葉佛時所有眾生貪欲薄」下，對上第三明迦葉佛雖有此經，眾生純善，不假為說，是故言滅。

Below, the Buddha answers him. First, in response to the first clause, he clarifies his past preaching: that the Dharma of Kāśyapa Buddha was extinguished in seven days means that the Hīnayāna Dharma was extinguished, while the Mahāyāna was not extinguished. From "Regarding what you just asked, whether Kāśyapa Tathāgata had this sūtra or not" below, in response to the second clause above, he clarifies that Kāśyapa Buddha truly had it and it was not absent. From "Sentient beings at the time of Kāśyapa Buddha were slight in greed and desire" below, in response to the third clause above, he clarifies that although Kāśyapa Buddha had this sūtra, because the sentient beings were purely virtuous, there was no need to preach it for them; therefore, it is said to be extinguished.