首楞嚴義疏注經 9.281

9.281

輕安是禪支，雖因定生，須慧覺察。忽然過分掉舉種生，好喜樂魔因茲得便。

Pliancy (praśrabdhi) is a limb of dhyāna; although it arises from samādhi, it requires wisdom to inspect it. Suddenly, excessive seeds of restlessness arise, and the demon fond of joy and pleasure takes advantage of this.