What, then, is the difference between them? Why, for one thing it is this--ISAIAH tells us that we must be righteous, John tells us how we may be. The one says, 'There are the conditions,' the other says, 'Here are the means by which you can have the conditions.' Love is the productive germ of all righteousness; it is the fulfilling of the law. Get that into your hearts, and all these relative and personal duties will come. If the deepest, inmost life is right, all the surface of life will come right. Conduct will follow character, character will follow love.
The efforts of men to make themselves pure, and so to come into the position of holding fellowship with God, are like the wise efforts of children in their gardens. They stick in their little bits of rootless flowers, and they water them; but, being rootless, the flowers are all withered to-morrow and flung over the hedge the day after. But if we have the love of God in our hearts, we have not rootless flowers, but the seed which will spring up and bear fruit of holiness.
But that is not all. Isaiah says 'Righteousness,' John says 'Love,' which makes righteousness. And then he tells us how we may get love, having first told us how we may get righteousness: 'We love Him because He first loved us.' It is just as impossible for a man to work himself into loving God as it is for a man to work himself into righteous actions. There is no difference in the degree of impossibility in the two cases. But what we can do is, we can go and gaze at the thing that kindles the love; we can contemplate the Cross on which the great Lover of our souls died, and thereby we can come to love Him. John's answer goes down to the depths, for his notion of love is the response of the believing soul to the love of God which was manifested on the Cross of Calvary. To have righteousness we must have love; to have love we must look to the love that God has to us; to look rightly to the love that God has to us we must have faith. Now you have gone down to the very bottom of the matter. Faith is the first step of the ladder, and the second step is love and the third step is righteousness.
And so the New Testament, in its highest and most blessed declarations, rests itself firmly upon these rigid requirements of the old law. You and I, dear brethren, have but one way by which we can walk in the midst of that fire, rejoicing and unconsumed, namely that we shall know and believe the love which God hath to us, love Him back again 'with pure hearts fervently,' and in the might of that receptive faith and productive love, become like Him in holiness, and ourselves be 'baptized with the Holy Ghost and with fire.' Thus, fire-born and fiery, we shall dwell as in our native home, in God Himself.