俱舍論疏 7.131

7.131

論「又欲生得至無間而起」，釋欲界生得，以明利故，能續色染後生防護彼定。色生得善定勝散劣，不明利故，不從無色染心生也。

The Śāstra says, "Furthermore, the desire-realm innate ... arises immediately [after it]": this explains that the desire-realm innate [wholesome mind], because it is clear and sharp, can immediately follow a form-realm defiled [mind] so as to guard that absorption. As for form-realm innate wholesome, its absorption is superior while dispersed [states] are inferior; because it is not clear and sharp, it does not arise from a formless-realm defiled mind.