The doctrine is compassion. Love for others and respect for their rights and dignity, no matter who or what they are: ultimately these are all we need. So long as we practice these in our daily lives, then no matter if we are learned or unlearned, whether we believe in Buddha or God, or follow some other religion or none at all, as long as we have compassion for others and conduct ourselves with restraint out of a sense of responsibility, there is no doubt we will be happy.