增壹阿含經 16.1.p2

16.1.p2

At the time, Venerable Nanda was staying in Nāgapuṣpa Park near the city of Śrāvastī. While residing in a secluded place, Venerable Nanda had this thought: “It’s so difficult to meet a Tathāgata when he appears in the world. It takes a million eons for him to appear, during which time he truly cannot be seen. It’s just a very long night until he appears. It’s like the time it takes for the udumbara flower to appear. It’s so difficult to meet a Tathāgata when he appears in the world. It takes a million eons for him to appear, during which time he truly cannot be seen. And there are other things that are hard to encounter: All actions coming to a stop, the end of craving without remainder, the lack of defilement, and the complete cessation of nirvāṇa.