Glossa Ordinaria
Catena Aurea · Matthäusevangelium 7
Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
(ord.) Though it be hard to do to another what you would have done to yourself; yet so must we do, that we may enter the strait gate.