Without wisdom and insight, clearly we can never have total self-confidence in what we are doing. With greater insight, we may be able to understand what is truly beneficial and what is truly harmful.
Wisdom cannot be developed or cultivated without the practice of meditation, which is the most important part of the Buddhist teachings. It establishes the link between wisdom adn ethics or moral conduct. It is through the practice of meditation that we discover which states of mind, emotions, thoughts, and attitudes are beneficial and which are harmful to ourselves and others, and also how these states influence our interaction with other people and the way we live our lives.
If we want t change our behaviour, we must have a greater understanding of our own minds and we need to change or attitudes. We also need to change the way we express our emotins. When we do this, we see that negative thoughts and emotions have to be gradually eradicated, not only because they are harmful to others but also because they are fundamentally very harmful to ourselves. That should be the basic motivation for wanting to overcome our negative emotional traits, attitudes, and thoughts.
When we see how important it is to change our mental outlook, we need a particular technique in order to achieve this. The technique is the practice of meditation.
Traleg Kyabgon Rinpoche IX