梵網經菩薩戒本疏 4.60

4.60

四、具緣者：一、是酒；二、起彼想；三、無重病；四、飲便犯。問：小乘律飲酒不通想、疑，此中何故有彼想耶？答：以酒為過源，故彼不通錯等。今據緣成，故具想也。是故文云：「若佛子故飲酒」。既云故飲，明知不故，即非正犯。

Fourth, having the complete conditions: 1. it is alcohol; 2. giving rise to the perception that it is alcohol; 3. being free of severe illness; 4. an offense is committed as soon as one drinks it. Question: in the Hīnayāna Vinaya, drinking alcohol does not depend on perception or doubt; why is there such a perception here? Answer: because alcohol is the source of faults, in that [Vinaya] errors and the like are not excused. Here it is established on the basis of conditions being complete; hence it includes perception. Therefore the text says: 'If a disciple of the Buddha intentionally drinks alcohol.' Since it says 'intentionally drinks,' we clearly know that if it is unintentional, it is not a direct offense.