This oneness with Christ, the fellowship of His Son, that we belong to Him and He to us, that we have an inheritance in Him and He has an inheritance in us, is a great truth. Like every other revealed truth it must be a reality in our lives. We are called by God to walk in this fellowship. We know we are in Him, and through Grace we abide in Him. But it is also written, "He that saith he abideth in Him ought himself also so to walk even as He walked." His own life must be manifest. In this fellowship of His Son we have the strength to walk as He walked, because we have His life and His Spirit. There is no need to walk after the flesh, but we can always walk in the Spirit and walking thus we walk as He walked. And this spiritual walk becomes possible as our hearts dwell in faith on the fact that we are called into the fellowship of His Son. We must have this wonderful fact constantly before our hearts as a real thing. Then all we do will be governed by it. If this is real how can we be conformed to this world? The world in all its aspects is the enemy of God. In that fellowship we walked once "according to the course of this world." Should we then turn back to it and enjoy its pleasures and ambitions? If we do, we walk in the flesh and then we do not know the joy and peace of the fellowship of His Son, but are joyless and miserable. But if the fact of the fellowship of God's Son is a reality in power, it will keep us from being conformed to this world. We believe the Spirit of God presses this home to the consciences of His people and calls us to a separated walk.