Every positive trait is the result of past good actions, and all can be a basis for you to rejoice. When you see someone possessed of physical beauty, think: "How wonderful it is that this person has a beautiful body now as a result of practicing patience and morality in past lives." When you see someone who is very wealthy, think: "How wonderful is it that this person is experiencing the good karma resulting from giving to other beings and making offerings to the Triple Gem in the past."

Lama Zopa Rinpoche, Transforming Problems into Happiness