大般涅槃經集解 44.6

44.6

案僧亮曰：言大王者，不直稱名，懼其喜過，漸開其心也。無上大師者，知佛慈等，真一切智也。智秀曰：第五佛命大王以定其心。

Sengliang notes: Saying 'Great King' rather than directly addressing him by name is because he feared his joy would be excessive, so he opened his mind gradually. 'Unsurpassed Great Master' shows he knew the Buddha's compassion is equal, being truly omniscient. Zhixiu says: In the fifth, the Buddha calls upon the Great King in order to settle his mind.