They demand the use of meditation, accumulation of wisdom, asceticism, rituals, good deeds, etc.Other religions state that humans can be saved only through the grace granted by an external personal agent.As emphasized in the previous article, the monotheistic religions state that the barrier between humans and God is sin.
1,4,10) and Tat tvam asi ("You are that" - in the Chandogya Up. Also to be noted is the importance of the sacred syllable ), which is said to exert a powerful influence on the one who knows how to use it and understands its metaphysical importance.
The Mandukya Upanishad establishes a correspondence between the three letters that compose it (A, U, and M) and the three states of consciousness mentioned above. Thus one becomes united with it as the arrow [becomes one with the target]." The same finality is stated in Shankara’s Vedanta.
This kind of liberation is actually an impersonal fusion of atman with Brahman, resembling the fusion of a drop of rain with the ocean, thus becoming one with it: As rivers flow into the sea and in so doing lose name and form, so even the wise man, freed from name and form, attains the Supreme Being, the Self-luminous, the Infinite.
He who knows Brahman becomes Brahman (Mundaka Upanishad 3,2,8-9).
The actual methods for attaining liberation are not yet fully developed in the Upanishads.