Chambers knew from Scripture and experience that the following was true:
He spoke of: Vision-Valley-Verity.
You receive VISION from God. You then go through the VALLEY, where the vision is tested ( often through disillusionment etc.) but you come out the other side with VERITY, that is the vision is proved to be true.
Remember that: Vision-Valley-Verity. It will give you understanding and aid you in fighting the good fight of faith