大方廣佛華嚴經疏 21.8

21.8

First, as for the intention of its occurrence: it is to assist transformation by praising and extolling, to expound the essence and nature of practice, and because it is that upon which practice relies. However, regarding the verses of praise in the three heavens, the general purport of their intention and central theme is largely the same, differing only in understanding, practice, and vow. The explanation of the name and the central theme also do not differ from the preceding, with only slight distinctions according to place and according to practice.