The world will reward you 10 times over. Think about your winning and losing words. Think about your mood and your mood swings. If it's more than five minutes, something's wrong. And your attitude, relationships, results and success will suffer.
Many people slip into cynicism day by day.
They become bitter because of their jealousy or envy of other people or because of their own misfortune. List the lessons you can learn from those for which you have bitterness, and the results will turn your thinking toward your own success and away from theirs. Celebrate victory and defeat. In my early days of selling, I would go to a department store and buy myself something every time I made a sale. After someone told me to celebrate both victory and defeat, I started buying myself something after I lost a sale, too.