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