分別功德論 5.9

5.9

所以稱優波先比丘具足眾行第一者，此比丘德行充足於內、形容端嚴於外，表裏相應，所適皆悅。難陀三十相、阿難二十相，表相雖多，於沙門威儀不能悉備。此比丘相雖十一，禮儀備舉，以備造適無往不應，長中幼年覩莫不歡。所謂內充者，謂四諦如有八正真妙，充實靈府未曾虛耗，故稱具足眾行道品之法為最第一也。

As for why the monk Upasena is said to be foremost in having all virtuous practices complete: this monk had virtue fully present within, and his appearance and bearing were dignified and solemn without; the internal and external were in harmony, so that wherever he went, all were delighted. Nanda possessed thirty marks, and Ānanda possessed twenty marks; although their external marks were many, they could not fully possess the dignified demeanor of a śramaṇa. Although this monk possessed only eleven marks, his ritual deportment was fully complete; because it was fully complete, wherever he went, all responded favorably, and elderly, middle-aged, and young alike beheld him with joy. What is meant by 'abundantly filled within' is that the four noble truths were as the eightfold correct path, truly subtle, filling his spiritual heart without ever declining; therefore he is said to be foremost in possessing all the virtuous practices and factors of the Path.