瑜伽論記 5.198

5.198

由緣三摩地至故名為勝者，釋定中得勝名所由，緣一類色不同，定前雜緣大小，故名為勝，或非三摩地色有大小相，是本質色，由緣三摩地乃至故名為勝是緣定中色，唯一類緣故名為勝，是前種種本質之影像故，前加行心有種種境相故不勝境不得勝名，三摩地中境唯一類心無異相故名為勝。

Regarding "by taking samādhi as object up to ... therefore it is called superior": this explains the reason why it receives the name "superior" within concentration. Because it takes a single category of form as object, unlike the mixed taking of large and small as objects prior to concentration, it is called superior. Alternatively, form that is not of samādhi has signs of large and small, being fundamental form; while "by taking samādhi as object up to therefore it is called superior" takes form within concentration as object, and because it takes only a single category as object, it is called superior, being the reflected image of the previously described diverse fundamental [forms]. Because the prior mind of preliminary preparation has diverse objective signs, it is not a superior object and does not receive the name superior; within samādhi, the object is of only a single category and the mind has no disparate signs, hence it is called superior.