成唯識論演祕 4.115

4.115

有助論主更難彼云：欲、色界有色，行感可名緣。無色界色無，如何云感色？

Someone, assisting the author of the Treatise, further challenges them, saying: In the desire and form realms there is form, so formations inducing it can be called a condition; in the formless realm form does not exist, so how can they be said to induce form?