Theodore Roosevelt said, “Believe you can and you’re halfway there.” When I read that, I think he meant that if you believe in yourself, you have one less boundary to break through. You are your worst critic. When I become scared and unsure of myself, I can think about that quote. It would give me the courage to try something new and do my best at it. I think that someone’s attitude could be changed because of this quote because it would give them more confidence and more courage. In the end, the positive changes in their life would make them happier. This quote could impact the world because many more people would be standing up for what they believe in and have better lives.