....Who is Siddhārtha Gautama Buddha? A cursory overview of the life of the Buddha and the basic tenants of Buddhism.

....It wasn’t until about 600 BCE, just before the time of the Buddha, that Upaniṣadic ideas were condensed into the Sāṃkhya system. And it’s upon the Sāṃkhya system that the different systems of yoga, those that recognised Vedic authority (Vedanta), and others that do not - Buddhism, Jainism and Charvaka-materialism, - base their arguments.

....It’s a daunting task to try to distill the essence of The Upaniṣads (800-200 BCE),which are the foundational philosophical texts of Hinduism and played an important role in the development of spiritual ideas in ancient India, marking a transition from Vedic ritualism to new innovative ideas in terms of philosophy and practice. They are divinely revealed philosophical teachings that search for the ‘truth’; the reality underlying the world of manifest reality of experience.