Creatures have all been engendered by Mind and Act. These are the two best paths adored of all. External acts yields fruits that are both transitory as also eternal. For acquiring the latter there is no other means than relinquishing the desire for fruits by the mind,
प्रजाः सृष्टा मनसा कर्मणा च द्वावेवैतौ सत्पथौ लोकजुष्टौ। दृष्टं कर्म शाश्वतं चान्तवच्च मनस्त्यागः कारणं नान्यदस्ति॥