Knowledge of God is obedience to God. Observe that we do not say that knowledge of God may also be obedience, or that of necessity it has obedience a… - Karl Barth

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Knowledge of God is obedience to God. Observe that we do not say that knowledge of God may also be obedience, or that of necessity it has obedience attached to it, or that it is followed by obedience. No; knowledge of God as knowledge of faith is in itself and of essential necessity obedience. It is an act of human decision corresponding to the act of divine decision; corresponding to the act of the divine being as the living Lord; corresponding to the act of grace in which faith is grounded and continually grounded again in God. In this act God posits Himself as our object and ourselves as those who know Him. But the fact that He does so means that our knowing God can consist only in our following this act, in ourselves becoming a correspondence of this act, in ourselves and our whole existence and therefore our considering and conceiving becoming the human act corresponding to the divine act. This is obedience, the obedience of faith.