Nisargadatta MaharajOnce you have understood that you are nothing perceivable or conceivable, that whatever appears in the field of consciousness cannot be your Self, you will apply yourself to the eradication of all self-identification, as the only way that can take you to a deeper realization of your Self. You literally progress by rejection – a veritable rocket.

Nisargadatta Maharaj

Tattva Bodha
Knowledge of Reality, by Śaṅkarāchārya

Tattva Bodha Reference Materials:

Video/Audio Lectures

Swami Paramarthananda
36 classes (~30 - 55 mins each) 1, 2

Swami Anubhavananda
7 classes (~75 mins each)

Tattvabodha English 2 of 7 @ Prem Puri 2012

Swami Sarveshananda
27 classes (~45 - 60 mins each)

Swami Swatmananda
22 classes (~60 - 90 mins each)

02 Vedanta Fundas - Tattvabodh introduction-02

Swami Narasimhananda
12 classes (~60 - 90 mins each)

Introduction to Vedanta Tattvabodha Narasimhananda 2

Swami Viditatmananda
9 classes (search for "Tattvabodha" on the linked page)