Your words, your thoughts, have great power over you. They have a great impact over the whole world that surrounds you also. You underestimate the power of the words you use. That is why you use them so casually, often negatively, especially when you talk inside yourself. Create positive words for your consciousness.
Now, decide to use correct and positive words only. Stop supporting the negative thoughts that come up inside you. Give your power and support only to the positive thoughts and feelings, twenty-four hours a day. If you find that you are in a low mood very often, try this:
Before going to sleep, sit up on your bed, tell yourself aloud that you are happy, that life is a beautiful experience, that hereafter, you are going to be joyful and blissful. Repeat this affirmation to yourself eleven times.
Now lie down. As your head touches the pillow, feel clearly that it is not just a pillow, but it is the very lap of Existence that you are falling asleep on. Relax and drop into your very source, into the welcoming embrace of Existence.
When you get up in the morning, before opening your eyes, repeat to yourself the same affirmation eleven times.
This can be extended to other negative emotions like fear, jealousy, worry, etc. Become aware of the negativity and decide to drop it. Replace it with the corresponding positive emotion and make it your affirmation.
source: Living Enlightenment