仁王護國般若波羅蜜多經疏 2.94

2.94

解曰：色謂色界。四靜慮地，如前已解。所言定者，心一境性。所作業者，略有三類：一者尋伺，謂初靜慮，有尋有伺；若中間禪，無尋唯伺；上三靜慮，無尋無伺。與此三種相應淨定，即不動行，能生彼故。從此第三明無色界業。

Exposition: "Form" refers to the form realm. The stages of the four dhyānas are as explained before. What is called "meditative concentration" is one-pointedness of mind. The "karmas generated" are briefly of three kinds: first, vitarka and vicāra, meaning the first dhyāna has both vitarka and vicāra; the intermediate dhyāna has no vitarka and only vicāra; the upper three dhyānas have neither vitarka nor vicāra. The pure concentrations associated with these three kinds are motionless karma, being capable of producing birth there. Next is the third: clarifying the karma of the formless realm.