Are you willing to think? Consider carefully, for the answer to that question will largely determine your success or failure in life. If you develop your judgment, use it. Exercise your power of judgment as often as you can, for the first rule of good judgment is practice. The functions of your mind, no less than the muscles of your body, receive their strength through repeated use.
Let's learn and label properly Disappointment and Discouragement for what they are - two completely different states of mind. Disappointment can be a spur to improvement that will contribute to success. But Discouragement is a mortal enemy that destroys courage and robs one of the will to fight. It is not circumstance that causes Discouragement, but one's own reaction to that circumstance. Everyone must meet Disappointment, many times; it is simply a part of life. When it is met, we may resign ourselves to Discouragement and failure. Or we may recognize each Disappointment as an asset by which we can profit, and take new strength from a lesson learned. The choice is ours, each time, to make.