This Upanishad desires its title from the opening words Isa-vasya, "God-covered." The use of Isa (Lord)--a more personal name of the Supreme Being than Brahman, Atman or Self, the names usually found in the Upanishads--constitutes one of its peculiarities. It forms the closing chapter of the Yajur-Veda, known as Shukla (White).
Oneness of the Soul and God, and the value of both faith and works as means of ultimate attainment are the leading themes of this Upanishad. The general teaching of the Upanishads is that works alone, even the highest, can bring only temporary happiness and must inevitably bind a man unless through them he gains knowledge of his real Self. To help him acquire this knowledge is the aim of this and all Upanishads.