What other idea of perfection of love can we have than this? The heart of such a person is made one with another heart, and what could we ask for more? This, then, more than any thing else, is the decisive mark of perfection in Christian love, viz. an entire coincidence of our own wills with the divine will; in other words, the rejection of the natural principle of life, which may be described as love terminating in self and constituting self-will; and the adoption of the heavenly principle of life, which is love terminating and fulfilled in the will of God. And this view, which is practically, as well as theologically, a very important one, seems to be confirmed by what the Savior says of himself in a number of passages. John 6. 38, "For I came down from heaven not to do mine own will, but the will of him that sent me." John 4. 34, "Jesus saith unto them, My meat is to do the will of him that sent me, and to finish his work." Heb. 10. 9, "Then said he, Lo, I come to do thy will, O God." The same idea, viz. that perfection of Christian love exists, and exists only in connection with a will united to and perfectly coincident with the will of God, is conveyed in that interesting passage, Mark 3. 34, 35, "And he looked round about on them which sat about him, and said, Behold my mother and my brethren! For whosoever shall do the will of God, the same is my brother, and my sister, and mother." Matt. 7. 21, "Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven, but he that doeth the will of my Father which is in heaven."
— edited from The Interior or Hidden Life (1844) Part 1, Chapter 17.