大乘起信論略述 2.136

2.136

[Treatise:] Briefly stated, there are four kinds of skillful means.
[Exposition:] Next, the second [part] re-explains the skillful means. Within this, there are two parts: first, indicating the number; later, specific explanations. This is the first. Among them, the first reveals the non-abiding path, and the latter three reveal the three clusters of pure precepts. Because they completely encompass all skillful means that accord with suchness, it says 'briefly stated, there are four kinds.'