It is a law of the mind that it gradually adapts itself to the subjects upon which it is trained to dwell. If occupied with commonplace matters only, it will become dwarfed and enfeebled. If never required to grapple with difficult problems, it will after a time almost lose the power of growth. As an educating power the Bible is without a rival. Patriarchs and Prophets page 58. ”It is a law of the mind that it will narrow or expand to the dimensions of the things with which it becomes familiar. The mental powers will surely become contracted and will lose their ability to grasp the deep meanings of the Word of God unless they are put vigorously and persistently to the task of searching for truth.