The third essential is constructive mental action. Every action of the mind should have something desirable in view and should have a definite, positive aim. Train yourself to face the sunshine of life regardless of circumstances. When you face the sunshine, everything looks right, and when everything looks right, you will think right. It matters not whether there is any sunshine in life just now or not. We must think of sunshine just the same. If we do not see any silver lining, we must create one in our own mental vision. However dark the dark side may seem to be, we cannot afford to see anything but the bright side, and no matter how small or insignificant the bright side may be, we must continue to focus attention on that side alone.