For preventing the destruction of all the worlds, and for preventing the destruction of deeds, the duties belonging to the four modes of life were practised by the wise of old.
अनुच्छेदाय लोकानामनुच्छेदाय कर्मणाम्। पूर्वैराचरितो धर्मश्चातुराश्रम्यसंकटः॥