Happiness that we experience is actually the freedom of limitations that we experience. In peak moments of happiness we forget about ourselves, the time and the place. That is total freedom. Happiness is that unlimited freedom that we enjoy which is neither bound by time nor bound by space. This is the base for positive feeling.
Fear is the negative aspect of freedom.
Fear is the feeling of limitation and so a sign of weakness. To have a positive attitude one should be free from fear. How does one get rid of fear. Fear is because of ignorance or lack of understanding. We fear a certain object until we know about it.