Mental well-being is as important as physical well-being for sound life of man, and perhaps even more important, since physical illnesses are related in varying degrees to psychological problems. Modern psychology emphasizes essential criteria for mental health and well-being. These include positive relationships with others, productivity and striving, responsibility, self-control, relative freedom from tension and anxiety, satisfaction with roles in life and life enjoyment. Fourteen centuries ago the Holy Quran and the "hadith" of Prophet Muhamad outlined the same essential criteria in detail. In social relationships Islam urges people to maintain positive behavior such as good character, altruism, forgiveness, fulfillment of obligations, justice and fairness. Islam instructs followers to avoid negative social behavior such as aggressiveness and hostility, speaking behind others, suspicion, ridicule, arrogance, pridefulness, contradiction and falsehood. Islam teaches that these values help develop a healthy personality, which strives for reward from Allah both in this world and in the hereafter. (LLL)