It may not be far from the truth to say that this attitude of renunciation is behind every moral virtue. Not only those who leave everyday life and embrace the life of a monk, but everyone is expected to practice renunciation to the extent to which he is able. Without such sacrifices, there cannot be perfect harmony in society. Thus, even the simplest of virtues, such as generosity, liberality, caring for one's parents, family, fellow beings and others cannot be practiced without an element of renunciation or sacrifice. This is the 'sacrifice' the Buddha emphasized.