法華經義記 5.54

5.54

問者又言：「如來既知必失解者，昔日不應用大乘化之。」解釋者言：「實知必失解，猶用大乘化者，此則為後化之資，後亦有大乘機發之時，佛言我昔日已曾為汝說此大乘，汝等于時不能堅固受持，廣起煩惱遂失此解。今復為汝說而尚不堅固受持。時眾既聞曾得遂失，仍發決定之心。故言前失得為後資，既有資力是故如來為說。」

The questioner further asks: 'Since the Tathāgata knew that they would definitely lose understanding, he should not have used the Great Vehicle to transform them in the past.' The commentator explains: 'Even though he truly knew that they would definitely lose understanding, he still used the Great Vehicle to transform them because this served as provision for later transformation; later there would also be a time when their capacity for the Great Vehicle would arise. The Buddha will say: "I already spoke this Great Vehicle for you in the past, but at that time you were unable to receptively uphold it firmly; you gave rise to widespread afflictions and consequently lost this understanding. Now I speak it for you again, yet you still do not receptively uphold it firmly." When the assembly at that time hears that having once attained it they consequently lost it, they will thereupon give rise to a resolute mind. Therefore it is said that the previous loss becomes provision for what comes later. Since there is this provisioning power, the Tathāgata spoke it for them.'