Each of us must learn to work not just for one self, one's own family or one's nation, but for the benefit of all humankind. Universal responsibility is the key to human survival. It is the best foundation for world peace.
I always emphasize that it is much safer and better to keep one's own religious faith. The other major religions are thousands of years old and have long traditions.
To be kind, honest and have positive thoughts; to forgive those who harm us and treat everyone as a friend; to help those who are suffering and never to consider ourselves superior to anyone else: even if this advice seems rather simplistic, make the effort of seeing whether by following it you can find greater happiness.
It helps remove whatever fears or insecurities we may have and gives us the strength to cope with any obstacles we encounter. It is the principal source of success in life. Since we are not solely material creatures, it is a mistake to place all our hopes for happiness on external development alone. The key is to develop inner peace.