The human soul, body, and consciousness are designed and built from pure Love. They also feed only on pure Love for their life sustenance. Your soul is constantly expelling the negativity from your body and mind. The poison must come out AND it must not be put onto others. The use of positive affirmations is a crucial part of a healthy heart, mind, and body.
Form does follow thought.
Where your thoughts take you is where your life follows. And since the spoken word wields the full power of Creation, whatever you speak, you create. This, naturally, applies to non-loving creations as well as loving ones. And energy, as most people know, can never be destroyed. It can only be altered from one form to another.