The Upanishads - Isa
Translated by Swami Paramananda - 1919

The Upanishads represent the loftiest heights of the ancient Indo-Aryan thought and culture.  They form the wisdom portion (Gnana-Kanda) of the Vedas.  These deal with the essentials of philosophic discrimination and ultimate spiritual vision.  For this reason, the Upanishads are known as the Vedanta, or the end or final goal of wisdom (Veda, wisdom; anta, end).

I find the Upanishads a wellspring of wisdom.  I have long wanted to do a series of posts on them, and the Isa Upanishad is a logical first choice.  It is the shortest of the Upanishads, and likely the oldest, as well.  It dates to at least the first half of the first century BC.   It is distinctly monotheistic, and focuses on the unity of all things.