“Śāriputra! The Buddhas appear in the evil worlds in which there are the five defilements.

The gist of this segment is as follows. The Sage did not intend to set up the doctrine of the three, but because beings mired in defilement were found to have difficulty in acquiring the one single enlightenment, [the Buddha] had no alternative but to come into the world to preach the three vehicles. How could he wish to do so [for his own sake]?