In this excerpt from the 13th Kopan Course, Lama Zopa Rinpoche advises that if we listen to the teachings but don't practice, our mind will not be transformed.
Rinpoche gave this advice about resolving complaints and dealing with interpersonal conflict at the Dharma center. Rinpoche said the real enemy and the cause of all our problems is the self-cherishing thought.
Milarepa achieved enlightenment by following the path, with much hardship
Lama Zopa Rinpoche: Milarepa