八識規矩補註 1.42

1.42

此第六識於初地初心轉成無漏，以分別二障無故。問：「三世斷何？若斷現惑，智不俱，過去已滅，未來不生，為斷於何？」曰：「但約智起惑除，令未來惑體不續生，名之為斷。」

This sixth consciousness is transformed into the taintless state at the initial mind of the first bhūmi, because the two discriminated obscurations are absent. Question: 'What is severed among the three times? If present afflictions are severed, wisdom is not concurrent [with them]; the past has already ceased, and the future has not arisen. What is it that is severed?' Answer: 'It is merely that through the arising of wisdom, afflictions are eliminated so that the substance of future afflictions does not continue to arise; this is called severing.'