Never in my past would I believe that what we speak, what we think would actually affect the environment. When I assumed that nobody was listening, someone did have their ear out. We are energy beings and thoughts emit energy frequency. If that thought is a sad, fear based or anything negative one, it emits a lower frequency. If our thoughts are loving, happy, or anything positive, it emits into a higher frequency.
Thoughts are things, but more importantly if you do not guard them well, they can affect your well-being, environment and even the world.
When you have a positive thought that thoughts can make you feel good. It sends a signal to the higher consciousness and can affect those around you. The same will happen for a negative thought. It affects us more than we even know. Who is listening? The universe. Thoughts equals feelings equals intentions equals actions.
The importance of paying attention and being thoughtful of your energy thoughts really do play an important part of human existence. When we are in a bad mood, it is easier to blow off steam, swear, say words that can hurt others in the heat of the moment. The problem with that however, is that it can affect the other person. Instead choose to feel the anger, sadness, acknowledge it for what it is, but don't act on it. Give yourself some time to get into a better mood. When you are in a better state of mind you can think clearly and make decisions not based on a low frequency.
Remember it is very important to mind your thoughts, happy thinking.