Book excerpt: The Indian philosopical heritage, particularly the advaita (non-dual) principle, is generally called Vedanta, so called due to its collective occurrence at the end of the great scriptures called the Veda-s. This text is a compilation of the weekly distributions through text and email to a small group of friends and relatives over a period of 5 years. The goal of this work is to introduce the principal sources of the Vedantic philosophy and to motivate the reader to study further this vast subject and also practice it in their daily lives. The prasthānatrayī (the set of trilogy of sources for philosophical journey) is generally considered as the fountainhead of the Vedānta philosophy. It consists of (1) the Upanishad-s (generally known as Śruti prasthāna, the set of revelations to the great sages as part of the four Veda-s; ṛk-, Yajur-, Sāma-, and Atharva-), (2) the Brahma Sūtrā-s (Nyāya prasthāna, logical set of axioms), and (3) the Bhagavad Gītā (Smriti prasthāna, part of remembered traditions). All the three parts of the trilogy are briefly covered in this text.