Book excerpt: From the bestselling author of Eat That Frog!, a motivational guide to using the Psychology of Achievement to banish negative thoughts and behaviors and unlock your full potential for success. Letting go of negative thoughts is one of the most important steps to living a successful, fulfilling life, but also often the most difficult. In this practical, research-based guide, bestselling authors Brian Tracy and psychotherapist Christina Stein present their "Psychology of Achievement" program to help you identify and overcome detrimental patterns and ideas preventing you from achieving your goals or feeling happy and satisfied in your life. Whether this negativity stems from a past relationship that ended badly, a childhood trauma, a business or career failure, or general insecurity, Tracy and Stein help you recognize how conscious--and more oftentimes unconscious--negativity affects your personality, your outlook and your decisions. Along the way, they show you how to regain control of your thoughts, feelings, and actions, turn negatives into positives, and learn to accept unexpected life changes without falling back into old negative patterns. Essential reading for anyone feeling stuck, BELIEVE IT TO ACHIEVE IT offers an important roadmap to conquer negativity and embrace the power of positive thinking to live a happy, successful life.