瑜伽論記 4.165

4.165

又論既云：了相猶為聞思之所間雜而言定地作意，故知色界亦有思慧。

Moreover, since the treatise states: 'Discerning characteristics is still interspersed with listening and contemplating', yet calls it a mental application of the concentrated stage, we know that the form realm also has wisdom arisen from contemplation.