瑜伽論記 15.310

15.310

方中，對法亦云：唯依色法因果建立諸方，若據在方名方，四蘊亦名為方，故上文云：隨在此處或在此生，即此方攝。

Regarding direction, the Abhidharmasamuccaya-bhāṣya also says: Directions are established solely based on the causes and effects of material phenomena. If one speaks in terms of being located in a direction and thus called a direction, the four aggregates are also called directions. Therefore the text above says: "Wherever one is situated in this place or born in this place, it is subsumed under this direction."