分別功德論 1.29

1.29

此六度無極事盡在菩薩藏，不應與三藏合。阿難欲使大小殊因緣，彼不相知。其理自空，難可明了。大士疑空者，不取證故，云狐疑也。

These matters of the six perfections are entirely contained in the Bodhisattva Piṭaka and should not be merged with the Tripiṭaka. Ānanda wished to distinguish the causes and conditions of the Great and the Lesser, [which were such that] they did not know each other. Their principle is intrinsically empty and difficult to understand clearly. When a Great Being doubts emptiness, it is because he does not grasp realization; hence it is called fox-like doubt.