Ātma-Bodha Introduction
Channel: Consciousness Research Centre
Date: 2024-01-14

"In the early hours of the day I meditate upon the Ātman, the Essential Self clearly experiencible in the heart-space;
That which is Existence-Knowledge-Bliss in nature; 
That which is the Paramahaṁsa State, the Supreme Goal;
That which is the Fourth State of Consciousness: turīya, that constantly illuminates all experiences in the waking, dream and deep-sleep states. 
I am That—partless, unchanging Brahman—not this aggregate of material envelopments."
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Śaṅkarācārya's Ātma-Bodha (Nikhilānanda) PDF
Contains an excellent overview of Advaita philosophy:
https://drive.google.com/file/d/1RHm9w9I-glivFN-st6IqsIuOQeUgrjgV/view?usp=share_link