There is no human being that does not get negative thoughts from time to time regardless of how spiritual or motivated he or she is, and if you do exist, please comment here with your secret! Some people are more capable of controlling their own mind and their thinking than others and that is just due to awareness. There is a whole industry filled with books, videos, and audio tapes dedicated to teaching "Mind Control" and "How to Think Positively", not to mention conferences held by those same people who produced those materials.
Anthony Robbins is one of the top Motivational Gurus of our time traveling the world to give seminars to millions of people trying to help them redefine themselves, their lives, and their view of the world around them. You can't always change the people and surroundings you're in but you can change the way you think about them. Anthony Robbins is just one of the many Motivational Speakers who teach step-by-step ways to overcome fears, become more confident, strive for and obtain higher goals, and many other helpful "Mind Control" tips.
I am also a firm believer of the "Law of Attraction" as explained in the the metaphysical book "The Secret". I know some religious people feel that science and religion are conflicting when it comes to God and a higher power but I believe it is all related and everyone is entitled to their own opinions and beliefs. For any of you intrigued by the metaphysical world, rent the video "What The Bleep Do We Know?" available on Netflix or from a local library.
I admit to having mood swings that sometimes bring me down, and although it seems like there's no "light at the end of the tunnel" sometimes, it is my faith in God and all of the positive reinforcements I've brainwashed myself with that gets me through those rough times. Some of my other favorite books are "The Spontaneous Fulfillment of Desire" and "The Seven Spiritual Laws of Success" by Deepak Chopra, MD, and "Manifest Your Destiny" by Dr. Wayne W. Dyer. Please comment and let me know what your favorite uplifting or motivating book is.