成唯識論述記 5.845

5.845

述曰：助成心事，名心所故。師謂博士，資謂弟子，如師作模畫形況已，弟子填綵，綵於模填，不離模故，如取總相；著綵色時，令媚好出，如亦取別相；心、心所法取境亦爾。何以知者？

The Commentary states: Because they assist and bring to completion the activity of citta, they are called caitasikas. 'Master' refers to the artisan; 'apprentice' refers to the pupil. Just as a master draws the outline and paints the forms, and then the apprentice fills in colors—the colors are filled into the outline without departing from the outline, which is like grasping the general mark; and when applying the pigments, he makes the beauty and charm appear, which is like also grasping the specific marks—citta and caitasika dharmas grasping objects are also like this. How is this known?