四十二章經 1.51

1.51

佛言：「諸沙門行道，當如牛負，行深泥中，疲極，不敢左右顧，趣欲離泥，以自蘇息。沙門視情欲，甚於彼泥，直心念道可免眾苦。」

The Buddha said: "When śramaṇas practice the Way, they should be like an ox carrying a burden through deep mud: utterly exhausted, it does not dare to look left or right, but hastens to get out of the mud so that it may rest. Śramaṇas should regard passions and desires as worse than that mud; by mindfully focusing straight on the Way, they can be free of all suffering."