成唯識論述記 8.121

8.121

述曰：然能生因是因緣者，或說六因，或說二因，且依〈菩薩地〉，若通取六，名進；若唯取二，名退；或取六中唯取種子是能生因，攝現不盡，名之為退；若并取現，名之為進。依有尋等地，若取六因，名之為進；唯取一因，名之為退。今此通說，皆如前說。

The Commentary states: As for the productive cause being the cause-condition, it is spoken of either as six causes or as two causes. Drawing provisionally on the *Bodhisattvabhūmi*: if one takes all six broadly, it is called 'expansion'; if one takes only two, it is called 'contraction.' Or, if among the six one takes only seeds as the productive cause, failing to subsume active states completely, this is called 'contraction'; if one also includes active states, this is called 'expansion.' Relying on the stage with vitarka and the like, if one takes six causes, it is called 'expansion'; if one takes only one cause, it is called 'contraction.' What is generally stated here is entirely as previously explained.