Niralamba Upanishad Teachings

The Supreme Self is Brahman alone. Brahma, Vishnu, Indra, Yama (Death), the Sun, the Moon, the gods, the demons, men, women, animals, etc.; the immobile, the Brahmanas, the Kshyatriyas, the Vaishyas, the Shudras etc.; are that very Spirit.

Heaven is association with Sat (Brahman or the Supreme Truth).

Hell is the deep association with that which brings about this worldly existence.

He is ignorant who has the egoistic conception of the body, caste, orders of life, actor, enjoyer and others.
Caste cannot refer to the skin, the blood, the flesh or the bone. There is no caste for Atma; caste is only conventional.

Pain is the mere thinking of the objects of the world.

Happiness is constant bliss – one attains this state of mind after having realized through experience the reality of the One Supreme Truth.
Niralamba Upanishad