Health of body and peace of mind are necessary for living a happy life. You can get health of body and peace of mind by following the principles of hygiene and ethics. Idleness, is the greatest enemy of happy life. So, you should cast off your idleness if any and do some useful and productive work. Adjustment, understanding, co-operation and tolerance are necessary for leading a happy life. So, also love, affection, sympathy and fellow feelings are necessary on your part for making your life happy.