Positive self-talk sounds pretty hippy-dippy but it can make a huge difference in your every day life. If you walk around all day telling yourself you suck and that you are ugly and that you can’t do it (whatever IT is) then it will become true.
“Your mind will be like its habitual thoughts;
for the soul becomes dyed with the color of its thoughts.”
~ Marcus Aurelius
If you don’t take things too personally and you keep your thoughts in the positive you will always have a better day. If you focus on the negatives all day then you will not only run yourself down but likely your day will be bleak. “No thought lives in your head rent free” and each thought you think literally uses some of your body’s electrical energy. You would be surprised at how run down you can get just running through random thoughts in the day.