俱舍論疏 14.75

14.75

論「有覆無覆至逆追成者」，釋二無記無成過、未，法力劣故。逆謂未來，追謂過去。

As for the treatise stating, "Defiled and undefiled […] possessed forward and retrospectively": this explains that the two indeterminate states have no possession of past and future, because the power of the phenomenon is weak. "Forward" refers to the future, and "retrospectively" refers to the past.