Believing in yourself and your abilities is absolutely the most important thing you can do on your journey.
You need to create a balance between too little self-confidence and too much. You cannot accomplish anything without self-confidence; on the other hand, too much self-confidence can ensure that you don’t try hard enough to reach your goals, and you will fall short of realizing your possibilities.
Once you understand that you truly can do anything you put your mind to, you will have unlocked the key to positive thinking. There is no limit to the power of the human mind. Your possibilities really are endless.