Major Upanishads - Divine Talks

Isha Upanishad

Discusses the all-pervading nature of God and the path of action vs. knowledge.

Inquires into the nature of Brahman as the source of all senses and mind.

The famous dialogue between Nachiketa and Yama about death and immortality.

Six students ask six profound questions to Sage Pippalada about life and the universe.

Distinguishes between higher knowledge (Para Vidya) and lower knowledge (Apara Vidya).

Analyzes the four states of consciousness (waking, dreaming, deep sleep, Turiya) and Om.

Describes the five sheaths (Koshas) of the self and the degrees of bliss.

Focuses on the creation of the universe and the identity of the Self with Brahman (Prajnanam Brahma).

One of the oldest and largest, containing the Mahavakya "Tat Tvam Asi".

The largest Upanishad, containing deep philosophical debates and the Mahavakya "Aham Brahmasmi".

Emphasizes theism and devotion (Bhakti) along with knowledge, identifying Rudra/Shiva as the Supreme.