By being aware, by knowing about negative karma and all the suffering results, we are persuaded to practice purification.
Lama Zopa Rinpoche
These teachings were given by Lama Zopa Rinpoche at the 36th Kopan Meditation Course at Kopan Monastery, Nepal in 2003. In this session, Rinpoche reminds us of the many kinds of negative karma we constantly accumulate and why it is so vitally important to practice purification every single day.  Read along with the transcript of these teachings at https://www.lamayeshe.com/article/chapter/lecture-18-how-vajrasattva-practice-purifies-negative-karma