Isavasya Upanishad
All Upanishads enunciate one goal, which is liberation and also prescribe vivid techniques of achieving the goal.
Isavasyopanishad is considered as one of the most prominent and unparalleled in its beauty and brevity amongst all known Mantropanishads. The text contains 18 mantras. The opening mantra is acclaimed as the most potent in the entire scriptures.