The more you think about your own self, the more self-centred you are, the more trouble even small problems can create in your mind. The stronger your sense of 'I', the narrower the scope of your thinking becomes; then even small obstacles become unbearable. On the other hand, if you concern yourself mainly with others, the broader your thinking becomes, and life's inevitable difficulties disturb you less.
Dalai LamaThe various features and aspects of human life, such as longevity, good health, success, happiness, and so forth, which we consider desirable, are all dependent on kindness and a good heart.
Dalai Lama