But whoever keeps his word, God's love has most assuredly been perfected in him. This is how we know that we are in him:
Hereby know we that we are in him He refers to that fruit of the gospel which he had mentioned, even fellowship with the Father and the Son; and he thus confirms the former sentence, by stating what follows, as a consequence. For if it be the end of the gospel to hold communion with God, and no communion can be without love, then no one makes a real progress in faith except he who cleaves from the heart to God. 