If you cannot stop worrying over something in the past or what might happen in the future, shift your focus to the inhalation and exhalation of your breath. Or recite this mantra: om mani padme hum. Since the mind cannot concentrate on two things simultaneously, either of these meditations causes the former worry to fade.
His Holiness the Dalai Lama
If we are serious about fostering world peace, we must first understand, generate, and experience real peace in our own mental stream. Awareness of peace is the foundation and goal of healing ourselves and the world. If our mind, or consciousness, is enjoying the awareness of peace, our everyday life will turn into a life of peace. Whatever we say will resound as the words of peace. Whatever we do will manifest as the expression of peace. Our mere presence will make the hearts of many blossom with happiness and harmony. Then we become one of the true peaceful members of society and a source inspiring others to true peace, too. Our every word and smile will send a genuine message of peace to others, and a true cycle of world peace and joy could be set in motion. So the inspiration of true world peace must take birth in our own heart.
Why is bodhicitta, the mind of enlightenment, so important? Because it is the immediate antidote for attachment to that sense of “I” that is the origin of samsara, the cycle of suffering. The unfounded belief in an illusory self pushes us to cherish ourselves and reject others, which finally turns against us and is the main cause of our sufferings in samsara. It is therefore essential to meditate all the time on love and compassion until we love others more than ourselves. That is the lifeblood of your spiritual practice and must always remain so.
Nyoshul Khen Rinpoche