Pseudo-Jerome
Catena Aurea · Markusevangelium 1
(Mal. 3:1) As it is written in the Prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee. The voice of one crying in the wilderness, (Isa. 40:3) Prepare ye the way of the Lord, make his paths straight.
Or else, Prepare ye the way of the Lord, that is, act out repentance and preach it; make his paths straight, that walking in the royal road, we may love our neighbours as ourselves, and ourselves as our neighbours. For he who loves himself, and loves not his neighbour, turns aside to the right; for many act well, and do not correct their neighbour well, as Eli. He, on the other hand, who, hating himself, loves his neighbour, turns aside to the left; for many, for instance, rebuke well, but act not well themselves, as did the Scribes and Pharisees. Paths are mentioned after the way, because moral commands are laid open after penitence.