(Taittirīyopaniṣad): The Taittiriya Upanishad is a Vedic text that speaks about the levels of bliss that can be experienced—from simple pleasure to unexcelled bliss—and the idea that existence is inherently ananda (blissful). Spiritual life consists in discovering the culmination of bliss, which is inherent in Brahman (the Absolute). This scripture also contains the first reference to the doctrine of the five koshas (“sheaths”), of which the fifth and final sheath is composed of Pure Bliss. In the Taittiriya Upanishad (2:4:1), we also find the first recorded mention of the word yoga in a technical sense, as the conscious control of the fickle indriyas (senses).