A deep awareness of the goodness of human beings, that they are essentially kind, helpful, and gentle, can give us courage and hope. On a personal level too, such a vision of our basic nature can help promote a greater sense of well-being and connectedness with others.
Making others happy is not a question of sacrificing our own happiness. Trying to make others happy, even when we do not always succeed, is a source of great satisfaction. Anger and hatred are signs of weakness, while compassion is a sure sign of strength.