This is a subject that ought to be studied more carefully from a comparative point of view. The Buddhists have developed a complete science based on various techniques – from Ānāpānasati (mindfulness of breathing) to Nianfo (repetition of names of Buddha) ; in most religions, there are often sacred words or prayers believers repeat, not for understanding but for entering into a peaceful, meditative state. In most situations when the mind is severely disrupted or traumatized, these techniques help to calm the mind and prevent the person from spiraling down into depression or even psychosis. These days we all hear so much about physical health, but so little about mental health. Regular practice on such mental repetition is like building up an immune system against sudden mental or emotional onslaughts. Even if you have no spiritual beliefs, don’t lose your cool, just count “one, two, three”.