大乘起信論義記 3.124

3.124

問中，初約現在信心有無，後約未來信心前後，內熏既齊，何得如是？皆應一時下，結成難，此則執別疑通難。

In the question, the first part concerns the presence or absence of faithful mind in the present; the second concerns the prior and posterior of faithful mind in the future. Since internal perfuming is equal, how could this be? From "all should simultaneously" onward concludes the objection; this is an objection that grasps at differences to doubt universality.