瑜伽論記 17.320

17.320

下釋，由彼二人神通勢力平等，然其所作不相似，故此一地事上水火神通互相障礙皆不得成，以威德相似不能相奪故也，彼後無間，爾時有一作是思，將無我定有退失耶？以起此餘心故通不得成。第二定者即於此所緣變事如如專住心無散亂，故所發皆無礙。若二通威德不等，隨其勝者成辨，映奪劣者不得成。若二通威德相似，先作意者成，後作意者不成。若二通相似同時作意於一事中所變各別，互相妨礙共不成。

The following explains: Because the power of their supernormal abilities is equal, yet what they produce is not identical, the supernormal powers of fire and water regarding the object on this same ground obstruct each other, and neither can succeed, because their formidable power is equal and they cannot overpower each other. Immediately thereafter, at that time, one [of them] has this thought: "Could it be that my concentration has degenerated?" Because this other thought arises, his supernormal power cannot succeed. The second practitioner of concentration exclusively focuses on this objective support and the transformed object without distraction, and therefore whatever he produces is unobstructed. If the formidable power of the two supernormal powers is not equal, it succeeds according to whichever is superior, overpowering the inferior one so that it cannot succeed. If the formidable power of the two supernormal powers is equal, the one who attends first succeeds, and the one who attends later does not succeed. If the two supernormal powers are equal and they simultaneously attend to the same object while their transformations are different, they obstruct each other and neither succeeds.