起信論疏筆削記 3.6

3.6

迷之下，即序中逐迷悟而升沈之義。解即初悟，悟即證入也。故經云：無始時來界，一切法等依，由此有諸趣，及涅槃證得。即斯義也。注文可知。

From "Under delusion..." below: this is the meaning in the preface of "ascending or descending following delusion or awakening." "Understanding" is initial awakening; "awakening" is realization and entry. Hence the sūtra says: "The realm from beginningless time / is the equal reliance of all dharmas; / due to this there exist all destinies / as well as the attainment of nirvāṇa." This is precisely that meaning. The commentary text is self-evident.