金光明經玄義 1.31

1.31

料簡三大乘者，若約因緣六度大乘者，此還是三人名別義同也。若約三人同用無生斷煩惱，三人同乘一乘，此則通教中乘也。若理隨得三乘，體相別異不同者，此則別教中乘也。三種並為得乘方便所攝也。《正法華》中明象乘，足三為四。羊、鹿、牛乘為得乘所攝，象乘即是理乘，如今之所明三乘也。《華嚴》中明四乘，三乘亦為得乘所攝，佛乘正是今之三乘義也。

In differentiating the three Mahāyānas: if explained in terms of the Mahāyāna of the six perfections through cause and condition, this is still where three persons have different names but the same meaning. If explained in terms of the three persons jointly employing the unproduced to sever afflictions, the three persons jointly ride the one vehicle; this then is the vehicle within the shared teaching. If the three vehicles are attained in accord with the principle, and their substances and characteristics are distinctly different and not identical, this then is the vehicle within the distinct teaching. All three kinds are subsumed under the expedients for attaining the vehicle. In the Saddharmapuṇḍarīka-sūtra, the elephant vehicle is explained, adding to the three to make four: the goat, deer, and ox vehicles are subsumed under [the expedients for] attaining the vehicle, while the elephant vehicle is the principle-vehicle, just like the three vehicles explained here. In the Avataṃsaka-sūtra four vehicles are explained: the three vehicles are also subsumed under [the expedients for] attaining the vehicle, and the buddha vehicle is precisely the meaning of the three vehicles here.