Barth, CD I/2 p.390:
At this point I should again like to quote H.F.Kohlbrügge: "The feeling of sin and misery begins and remains in us, the more we are irradiated by the sun of righteousness. Whoso is born of God has his supreme good in God alone; nothing else can satisfy him. Idols must all give place one after the other. But the more the love of God increases in the heart, the more knowledge there is of inability, and, even with the best of wills, unwillingness, to love God the Lord, and to love Him with all the heart and soul and mind and strength. The spirit will not come from the flesh..."
According to Kohlbrügge, there are definite marks of a sorrowful kind by which the children of God can know that the love of God is in them. These are weeping, groaning, crying, sorrow and concern because in their hearts they find only perversity and hostility, only the love of sin and the world and the things which are seen, because they have no desire at all for God and his love, but a cold, sluggish, hard and stony heart, filled with all kinds of evil considerations and other sinful thoughts. Therefore the children of God must at all points humble themselves before the holiness of God. They must bow beneath His holy law. They must be crushed and broken in respect of the love of God and neighbour. They must be humbled to the very core. They must apply to themselves what the apostle Paul says in the seventh chapter of Romans, especially of the sin which the regenerate find in themselves in the light of God's law. For the fact that they are overwhelmed in this way proves that the love of God is in them."
What he said.