Often times we are letting poison and negative thoughts into our mind which make us miserable. We must always practice presence. The goal is to always be conscious of your state of mind. Whether you are working, relaxing, living, or doing anything, you want to be conscious of what you are letting into your mind. The more time you can be in the conscious state, the successful you will be.
Use the acronym ABC to remember this, or trying carrying a rock with you.