There are many things in life that happen that can either get us down or teach us how to over come them. Whenever challenges present themselves to us, we all have 2 choices, we can give up and be over come with it or do whatever it takes to rise above the challenge. The concept of mind over matter, helps encourage me through situations that present themselves to bring me down. Mind over matter is the belief that the mind is more powerful than the circumstances that surround you.
If you find yourself getting discouraged it's more than likely the circumstance has control over you, with a simple change of attitude you can retake control. Attitude is a little thing that makes a big difference. ~Winston Churchill
With the right attitude you can be equiped to deal with anything that comes your way. Your mind is a powerful tool, why not use it for the positive. Like Ford said, Whether you think that you can, or that you can't, you are usually right.
Life is a gift and is short, it's important when a problem presents itself to remember that in retrospect it's not "the end of the world," and not to allow it to defeat you. The less you allow little things to bring you down, the more you can start seeing the joy that is life!