All this, whatsoever exists in the universe, should be covered by the Lord. Having renounced (the unreal), enjoy (the Real). Do not covet the wealth of any man.
We cover all things with the Lord by perceiving the Divine Presence everywhere. When the consciousness is firmly fixed in God, the conception of diversity naturally drops away; because the One Cosmic Existence shines through all things. As we gain the light of wisdom, we cease to cling to the unrealities of this world and we find all our joy in the realm of Reality.
The word "enjoy" is also interpreted by the great commentator Sankaracharya as "protect," because knowledge of our true Self is the greatest protector and sustainer. If we do not have this knowledge, we cannot be happy; because nothing on this external plane of phenomena is permanent or dependable. He who is rich in the knowledge of the Self does not covet external power or possession.
II
If one should desire to live in this world a hundred years, one should live performing Karma (righteous deeds). Thus thou mayest live; there is no other way. By doing this, Karma (the fruits of thy actions) will not defile thee.
If a man still clings to long life and earthly possessions, and is therefore unable to follow the path of Self-knowledge (Gnana-Nishta) as prescribed in the first Mantram (text), then he may follow the path of right action (Karma-Nishta). Karma here means actions performed without selfish motive, for the sake of the Lord alone. When a man performs actions clinging blindly to his lower desires, then his actions bind him to the plane of ignorance or the plane of birth and death; but when the same actions are performed with surrender to God, they purify and liberate him.
III
After leaving their bodies, they who have killed the Self go to the worlds of the Asuras, covered with blinding ignorance.
The idea of rising to bright regions as a reward for well-doers, and of falling into realms of darkness as a punishment for evil-doers is common to all great religions. But Vedanta claims that this condition of heaven and hell is only temporary; because our actions, being finite, can produce only a finite result.
What does it mean "to kill the Self?" How can the immortal Soul ever be destroyed? It cannot be destroyed, it can only be obscured. Those who hold themselves under the sway of ignorance, who serve the flesh and neglect the Atman or the real Self, are not able to perceive the effulgent and indestructible nature of their Soul; hence they fall into the realm where the Soul light does not shine. Here the Upanishad shows that the only hell is absence of knowledge. As long as man is overpowered by the darkness of ignorance, he is the slave of Nature and must accept whatever comes as the fruit of his thoughts and deeds. When he strays into the path of unreality, the Sages declare that he destroys himself; because he who clings to the perishable body and regards it as his true Self must experience death many times.