There are faith, hope, and love, and the greatest of these is love. But greater than love is obedience, if the love does not include obedience.
The greatest commandment is to love God with all our heart and strength. But implicit in that love is obedience. Genuine love for God works out in strict obedience to God. Apart from obedience to the Father there is no love for God and there is no Kingdom of God
