16 So we have come to know and to believe the love that God has for us. God is love, and whoever abides in love abides in God, and God abides in him. 17 By this is love perfected with us, so that we may have confidence for the day of judgment, because as he is so also are we in this world. 18 There is no fear in love, but perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love. 19 We love because he first loved us. - 1 John 4:16-19
“For so hath God contrived and constituted things, in his dispensations towards his own people, that when their love decays, and the exercises of it fail, or become weak, fear should arise; for then they need it to restrain them from sin, and to excite them to care for the good of their souls, and so to stir them up to watchfulness and diligence in religion: but God hath so ordered, that when love rises, and is in vigorous exercise, then fear should vanish, and be driven away; for then they need it not, having a higher and more excellent principle in exercise, to restrain them from sin, and stir them up to their duty. There are no other principles, which human nature is under the influence of, that will ever make men conscientious, but one of these two, fear or love; and therefore, if one of these should not prevail as the other decays, God’s people, when fallen into dead and carnal frames, when love is asleep, would be lamentably exposed indeed: and therefore God has wisely ordained, that these two opposite principles of love and fear should rise and fall, like the two opposite scales of a balance; when on rises the other sinks. As light and darkness necessarily and unavoidably succeed each other; if light prevails, so much does darkness cease, and no more; and if light decays, so much does darkness prevail; so it is in the heart of a child of God: if divine love decays and falls asleep, and lust prevails, the light and joy of hope go out, and dark fear and doubting arises; and if, on the contrary, divine love prevails and comes into lively exercise, this brings in the brightness of hope, and drives away black lust, and fear with it. Love is the spirit of adoption, or the childlike principle; if that slumbers, men fall under fear, which is the spirit of bondage, or the servile principle; and so on the contrary. And if it be so, that love, or the spirit of adoption, be carried to a great height, it quite drives away all fear, and gives full assurance; agreeable to that of the apostle, 1 John 4:18, “There is no fear in love, but perfect love casts out fear.” These two opposite principles of lust and holy love, bring hope and fear into the hearts of God’s children, in proportion as they prevail; that is, when left to their own natural influence, without something adventitious, or accidental intervening; as the distemper of melancholy, doctrinal ignorance, prejudices of education, wrong instruction, false principles, peculiar temptations, etc.
Fear is cast out by the Spirit of God, no other way than by the prevailing of love; nor is it ever maintained by his Spirit but when love is asleep.”
- Jonathan Edwards, Treatise Concerning the Religious Affections