大乘起信論裂網疏 6.123

6.123

此示即止而觀也。念一切法自性涅槃，一心真如門也，止也。即見因緣業報不失不壞，一心生滅門也，觀也。秖於不生不滅性中，妄有因緣生滅，則四諦皆唯一心明矣。以世間因果即苦、集，出世因果即道、滅，十界差別皆是心生滅門，皆依真如門故。

This shows special insight within calm abiding. Contemplating that all phenomena are by their own nature nirvāṇa is the aspect of tathatā of the one mind, which is calm abiding. Directly perceiving that causes, conditions, and karmic retributions are neither lost nor destroyed is the aspect of arising and ceasing of the one mind, which is special insight. Simply within the nature that neither arises nor ceases, there is the false appearance of conditional arising and ceasing; thus it is clear that the four truths are solely the one mind. Because worldly causes and effects are suffering and origin, and transworldly causes and effects are the path and cessation, the distinctions of the ten realms are all the aspect of arising and ceasing of the mind, and are all based on the aspect of tathatā.