Developing a positive outlook on life is extremely beneficial. Though, being realistic and allowing emotions to flow, letting one's intuition be the guide, without repression, resistance, or fixation on the positive or negative, is what is key.
1:11 - Believe in Yourself
2:54 - Seeing the Positive of the Negative
5:49 - Being Realistic
Meditation & Self-Hypnosis - http://www.youtube.com/watch?v=iIbeH4eRdQY