and here
At the heart of all mental problems are always ties (attachments in traditional Buddhist terminology); they hinder the expression of your true self, which is a pure negation. By mistake you identify yourself with your attachments, ie, instead of identifying yourself with your potential, you identify with the past. Therefore, in the long term, it makes no sense to separate attachments into 'bad', which cause suffering, and 'good', which cause positive emotions: to get rid of the former, you should start with the later, and there are several general rules how to do this effectively.