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:
That no mention is here made of what is due to men, ought not to be viewed as unreasonable; for brotherly love flows immediately from the love of God, as we shall hereafter see. Whosoever, then, desires that his life should be approved by God, must have all his doings directed to this end. If any one objects and says, that no one has ever been found who loved God thus perfectly; to this I reply, that it is sufficient, provided every one aspired to this perfection according to the measure of grace given unto him. In the meantime, the definition is, that the perfect love of God is the complete keeping of his law. To make progress in this as in knowledge, is what we ought to do. 