The presence of God's Spirit in any man can of course only be verified by the results. God's Spirit working in and by means of man's nature cannot be known in separation from the man's spirit and the work done in that spirit. This inward revelation which Paul refers to is accomplished by the action of the Divine Spirit on the human faculties, quickening and elevating these faculties. The revelation or new knowledge acquired by Paul was given by God, but at the same time was acquired by Paul's own faculties, so that it remained with him always, just as the knowledge we naturally acquire remains with us and can be freely used by us. An inward revelation can come to a man only in the form of impressions, convictions, thoughts arising in his own mind. Paul knew that his knowledge was a revelation of God, not by the suddenness with which it was imparted, not by supernatural appearances accompanying it, not by any sense or consciousness of another Spirit working with his own, but by the results. It is always the substance or contents of any revelation which proves its origin. Paul knew he had the mind of Christ because he found that he could understand Christ's words and work, could perfectly sympathize with His aims and look at things from Christ's point of view. In their humility, many persons shrink from making this affirmation here made by Paul; they cannot ever unhesitatingly affirm that the Spirit of God is given them or that they have the mind of Christ. Such persons should recognise that it was the very humility of Paul which enabled him so confidently to affirm these things of himself. He knew that the knowledge of Christ's purposes he had and the sympathy with them were the evidence of God's Spirit working in him. He knew that without God's Spirit he himself could never have had these thoughts. And it is when we recognise our own insufficiency most that we are readiest to confess the presence of God's Spirit.