瑜伽論記 2.174

2.174

If [you] say that the effect has a cause, then since manifestation has a cause, this cause could also be manifested. However, while the nature of the effect can be manifested, the cause cannot be manifested; that an unmanifested cause could manifest an effect is unreasonable. The syllogism is: The present cause should be unable to manifest, because the effect itself is not manifested, just as when the effect was not yet manifested.