Upanishads : Seers of the Upanishads

These seventeen discourses of this wonderful collection of the Upanishads say: This Upanishad is the manifestation of the subtlest mysteries of spirituality. This Upanishad is the song of a flower you have not yet seen. The song is wonderful: the singer has seen the flower. But don't be satisfied with the song, the song is not the flower.