四分律刪繁補闕行事鈔 1.55

1.55

That is to say, within this school, where both text and meaning are complete and there is no deficiency with regard to affairs, the school's own text is self-sufficient; why rely on external sources? Elsewhere, where the Vinaya text is unclear, where an affair existed prior to an abrogation, where there is meaning but no text, or where there is an affair without a text—in numerous cases like these, one draws from other schools to complete this single school.