大乘起信論略述 2.223

2.223

論。應觀世間至無一可樂　述曰。此觀不淨除淨倒也。此除四倒名法相觀。除前第一心沈沒失。

[Treatise:] One should contemplate worldly [... none is delightful]. [Exposition:] This contemplates impurity to remove the inversion of purity. Removing these four inversions is called the contemplation of dharmalakṣaṇa. It removes the first fault mentioned earlier, the sinking of the mind.