大毘盧遮那成佛經疏 1.21

1.21

經復云「祕密主！是阿耨多羅三藐三菩提，乃至彼法小分無有可得。」無上正遍知義，前已說之。此中言小分者，梵云阿耨，即是七微合成，於從緣生色最為微小，故以為喻。言彼法者，離此無相菩提心外更無一法也。

The sūtra further says: 'Secret Lord! In this anuttarasamyaksaṃbodhi, even the slightest fraction of that dharma is unattainable.' The meaning of unsurpassed right and complete awakening has been explained above. Here, 'slightest fraction' translates the Sanskrit aṇu, which is composed of seven minute atoms, the smallest among matter produced from conditions; hence it is used as an analogy. 'That dharma' means that apart from this formless bodhicitta, there is not a single dharma.