Words and thoughts have their own energy, including self talk. Everything you think and say affects your personal vibration, and the way you feel.
Positive, happy thoughts have a high vibrational frequency, while the energy of negative thoughts has a much lower vibration.
We are also made up of different bodies of energy, all vibrating at different rates. We have a subtle energy body as well as a physical body. So it is logical that the types of thoughts we have will affect the vibration of our whole being. And our vibration affects our emotional, mental, physical and spiritual health. It also determines what we attract to ourselves. An energy body with a negative or low vibration will attract things to it that also have a negative vibration. A positive or high frequency body will attract other positive things.
The self talk that goes through our head also creates emotions. It is always the thought that comes first, and then the feelings will follow. So the type of inner talk that you have going on will decide how you feel throughout the day.
So what type of mind chatter would you prefer to have? I guess the answer is pretty obvious!