EXCERPT :

Research shows that approximately 87% of the things we say to ourselves about ourselves are negative, self-destructive, and undermining. This negative self-talk leads to a self-fulfilling prophecy – what we tell ourselves creates a mindset which makes our self-talk come true. Optimists know that – sometimes, people know it naturally on a subconscious level and seldom need positive self-talk; other times, people become optimists through deliberately practicing positive self-talk. Negative self-talk increases your unhappiness and incompetence.