Those who have believing masters, let them not despise them, because they are brothers, but rather let them serve them, because those who partake of the benefit are believing and beloved. Teach and exhort these things.
These things teach and exhort. He means that these are matters on the teaching of which he ought to dwell largely, and wishes that doctrine should be accompanied by exhortations. It is as if he had said, that this kind of instruction ought to be daily repeated, and that men need not only to be taught, but likewise to be roused and urged by frequent exhortations. 