one of the oldest Brahmanas, includes eight ritual suktas (hymns) for the ceremony of marriage and rituals at the birth of a child. The first hymn is a recitation that accompanies offering a Yajna oblation to Agni (fire) on the occasion of a marriage, and the hymn prays for prosperity of the couple getting married. The second hymn wishes for their long life, kind relatives, and a numerous progeny. The third hymn is a mutual marriage pledge, between the bride and groom, by which the two bind themselves to each other. The sixth through last hymns of the first chapter in Chandogya Brahmana are ritual celebrations on the birth of a child and wishes for health, wealth, and prosperity with a profusion of cows and artha. However, these verses are incomplete expositions, and their complete context emerges only with the Samhita layer of text. Aranyakas and Upanishads The Aranyakas layer of the Vedas include rituals, discussion of symbolic meta-rituals, as well as philosophical speculations. Aranyakas, however, neither are homogeneous in content nor in structure. They are a medley of instructions and ideas, and some include chapters of Upanishads within them. Two theories have been proposed on the origin of the word Aranyakas. One theory holds that these texts were meant to be studied in a forest, while the other holds that the name came from these being the manuals of allegorical interpretation of sacrifices, for those in Vanaprastha (retired, forest-dwelling) stage of their life, according to the historic age-based Ashrama system of human life. The Upanishads reflect the last composed layer of texts in the Vedas. They are commonly referred to as Vedānta, variously interpreted to mean either the "last chapters, parts of the Vedas" or "the object, the highest purpose of the Veda". The central concern of the Upanishads are the connections "between parts of the human organism and cosmic realities." The Upanishads intend to create a hierarchy of connected and dependent realities, evoking a sense of unity of "the separate elements of the world and of human experience [compressing] them into a single form." The concepts of Brahman, the Ultimate Reality from which everything arises, and Ātman, the essence of the individual, are central ideas in the Upanishads, and knowing the correspondence between Ātman and Brahman as "the fundamental principle which shapes the world" permits the creation of an integrative vision of the whole. The Upanishads are the