{But I say unto you that hear} (Alla humin leg(9320)tois
akouousin). There is a contrast in this use of alla like that
in  Mt 5:44 . This is the only one of the many examples given by
 Mt 5  of the sharp antithesis between what the rabbis taught and
what Jesus said. Perhaps that contrast is referred to by Luke. If
necessary, alla could be coordinating or paratactic conjunction
as in  2Co 7:11  rather than adversative as apparently here. See
 Mt 5:43f.  Love of enemies is in the O.T., but Jesus ennobles
the word, agapa(935c), and uses it of love for one's enemies.