Is there any of us who has not been depressed on occasion? Whether the cause of the distress was our health, material circumstances, the loss of a loved one, or as a result of our impoverished spiritual state, we became quite unhappy.
For most people, this state of "blueness" will be temporary. Particularly is the case if we are wise enough to consult the Owner's Manual given by the One who made us. Our Maker, of course, is God, and His Book for contented living is the Holy Bible. The Scriptures are the best source of human psychology upon this planet. It is truly tragic that they are so neglected as a guide for happiness.