The power of steam has always been available to man, but it took a James Watt to sit in his kitchen one day and watch the kettle boil to get a vision of a new energy source that eventually produced the railway locomotive. The power of electricity has always been available, but it took a Benjamin Franklin to be out flying a kite on a stormy day and watch the lightning strike his kite to get a vision of harnessing another source of energy. In the athletic world, the major problem in setting a new world record is not the physical challenge but the mental. An athlete has to be first convinced that the record can be broken and then it becomes possible. Pole vaulters now sit in their room and visualize themselves going over the bar with room to spare.
Golfers visualize their putt running perfectly across the green and into the cup.
The principle of vision enables you to see that the best is available to you and to be convinced of its possibility. God is a God of principle. It was He who set up the operation of the universe on a set of principles, and it was He who created man and laid down for him positive principles of living. God has declared Himself to be the great unchanging One. God is One who does not operate capriciously but only in line with His declared principles.