四分律行事鈔資持記 2.328

2.328

二互用四門，從寬至狹。初互可知；二當分者，各就一寶，論彼此故；三像寶者，各就彼此，分事理故；四一一者，各就事中，物類別故。隨釋自見。

In the second [part], the four categories of mutual use proceed from the broad to the narrow. The first, 'mutual [use]', can be understood. The second, 'proper division', refers to discussing this or that with respect to each individual jewel. The third, 'likeness jewels', refers to dividing principle and phenomena with respect to each other. The fourth, 'individual items', refers to the distinct categories of items within phenomenal things. These will become evident as they are explained in sequence.