大方廣圓覺修多羅了義經略疏 1.177

1.177

The first five characters are what is expressed: "Perfect Enlightenment" is the Dharma, and "Great Expansive" indicates its meaning. Hence in the text, whether indicating or summarizing, each reference mentions only Perfect Enlightenment, and does not mention "Great" and the rest. The latter six characters pertain to that which expresses: "Sūtra" is the teaching. "Sūtra of Ultimate Meaning" praises the superior capacity of the teaching. The scripture has five titles, but the opening title contains only two. Truly it is because the central root, essence, and function are the grand framework of the Dharma and its meaning, while the expression, purport, and efficacy are the clear mirror of words and imagery. When matters are comprehensive and meanings are exhausted, five titles must be established; for a concise and essential title, two designations are provisionally retained. The three characters "Great" and so forth are essence, attribute, and function, each possessing two meanings: