If you have had a bad day, it is just a bad day, and you HAVE NOT failed. Failure is not the failing; it is the staying down.
When things are going well, we feel elated. When hardships come, we sink into depression. But true joy transcends the rolling waves of circumstance. Joy comes from a consistent relationship with Jesus Christ. When our lives are intertwined with his, he will help us to walk through adversity without sinking into debilitating lows and manage prosperity without moving into deceptive highs. The joy of living with Jesus Christ daily will keep us levelheaded, no matter how high or low our circumstances (from the Study Bible Commentary on John 15:11)