俱舍論記 7.129

7.129

「色界善心至由升進故」者，此明色善容得三心，由二位得：一由入定、二由離染。謂諸異生初伏欲界入未至定得色善心，復由離欲染故第九解脫道得根本定，得欲、色二通果心。如是二位從欲入色，從加行入根本皆名升進。所以不名得學心者，如世第一法在現在時未成學心，若苦法忍至現在時復非是色界善心現在前，故色善心非得學心。以此故知，此中得言，顯成就也。

Regarding the passage from "A wholesome mind of the form realm" up to "because of advancement": this clarifies that a form-realm wholesome [mind] may acquire three minds, acquired through two positions: first, through entering concentration; second, through separation from passion. That is to say, ordinary persons first subdue the desire realm, enter the threshold concentration, and acquire a form-realm wholesome mind; furthermore, because of separation from passion for the desire realm, at the ninth path of liberation they acquire the fundamental concentration and acquire the two fruition-of-mastery minds of desire and form [realms]. These two positions—going from desire to form, and going from preparatory to fundamental—are both termed "advancement." The reason this is not called acquiring a trainee mind is that, when the worldly supreme dharma is in the present, one has not yet accomplished the trainee mind; and when the patience with the dharma of suffering arrives in the present, it is no longer a form-realm wholesome mind manifesting; therefore, with a form-realm wholesome mind one does not acquire the trainee mind. From this it is known that the word "acquire" here indicates possession.