大般涅槃經疏 13.20

13.20

「復次世尊」下，三是推佛證果，身力具足豈當有病？又二：先明身力、次明智力。初身力中，廣舉諸力格量。優鉢羅等象者，此象色青。芬陀利，色赤。二云象行時足下有華，如優鉢羅，因以名之。大拏云：行蓮華上白象，即其證也。又云：雷震時芽上生優鉢羅華，故以為名。餘者例之。鉢建提，此翻堅固。那羅延，此翻金剛。

From 'Furthermore, World-Honoured One' downward, the third is deducing the Buddha's realization of fruition: possessing complete physical strength, how could he possibly have illness? This again has two [parts]: first, clarifying physical strength; next, clarifying intellectual strength. In the first, on physical strength, it broadly cites various strengths for comparison. As for 'elephants such as utpala', this elephant is blue in color. Puṇḍarīka is red in color. The second explanation says that when the elephant walks, there are flowers under its feet like the utpala, and it is named accordingly. The [story of] Prince Sudāna says: 'The white elephant that walks upon lotus blossoms', which is proof of this. Another says: when thunder rumbles, utpala flowers grow upon its tusks, and so it is named from this. The rest are by analogy. *Bhakataya* (bhaktendu / bhati?) translates here as 'firm'. Nārāyaṇa translates here as 'adamantine'.