...that all the esoteric teachings throughout the ages basically point to the same thing... From my own personal experiences I would confer... Weather it be Gnostic Christianity, Taoism, Sufism, Buddhism, ect... A great Oneness is always the conclusion... Hinduism for example...

"Brahman (nominative brahma ब्रह्म) is a concept of Hinduism. Brahman is the unchanging, infinite, immanent, and transcendent reality which is the Divine Ground of all matter, energy, time, space, being, and everything beyond in this Universe. The nature of Brahman is described as transpersonal, personal and impersonal by different philosophical schools. In the Rig Veda, Brahman gives rise to the primordial being Hiranyagarbha that is equated with the creator God Brahmā. The trimurti can thus be considered a personification of hiranyagarbha as the active principle behind the phenomena of the universe. The seers who inspired the composition of the Upanisads asserted that the liberated soul (jivanmukta) has realized his identity with Brahman as his true self (see Atman (Hinduism)).

The word "Brahman" is derived from the verb brh (Sanskrit:to grow), and connotes greatness. The Mundaka Upanishad says:

Om- That supreme Brahman is infinite, and this conditioned Brahman is infinite. The infinite proceeds from infinite. Then through knowledge, realizing the infinitude of the infinite, it remains as infinite alone."

Conceptualization

The Supreme Cosmic Spirit or Absolute Reality called Brahman (not to be confused with the creator God Brahmā) is said to be eternal, genderless, omnipotent, omniscient, omnipresent, and ultimately indescribable in human language. The sage-seers of the Upanishads had fully realised Brahman as the reality behind their own being and of everything else in this universe. They were thus Brahmins in the true sense of the word. These rishis described Brahman as infinite Being, infinite Consciousness and infinite Bliss (satcitananda). Brahman is regarded as the source and essence of the material universe. In its purest reality it is unmanifest (Nirguna Brahman) and thus beyond being and non-being. The Rig Veda records that in its initial manifestation (Saguna Brahman) as pure primordial Being Brahman is Hiranyagarbha (lit. golden womb), a fertile substrate (which Radhakrishnan calls the 'world-soul') out of which all worlds, organisms and even Gods and other divine beings (devas) arise:

"Great indeed are the devas who have sprung out of Brahman." — Atharva Veda

Nirguna Brahman corresponds to the concept of 'Godhead' and Saguna Brahman to God as the Primordial Being.

It is said that Brahman cannot be known by material means, that we cannot be made conscious of it, because Brahman is our very consciousness. Brahman is also not restricted to the usual dimensional perspectives of being, and thus enlightenment, moksha, yoga, samadhi, nirvana, etc. do not merely mean to know Brahman, but to realise one's 'brahman-hood', to actually realise that one is and always was of Brahman nature (similar or identical with the Mahayana concept of Buddha Nature). Indeed, closely related to the Self concept of Brahman is the idea that it is synonymous with jiva-atma, or individual souls, our atman (or soul) being readily identifiable with the greater soul (paramatma) of Brahman.

Generally, Vedanta rejects the notion of an evolving Brahman since Brahman contains within it the potentiality and archetypes behind all possible manifest phenomenal forms. The Vedas, though they are in some respects historically conditioned are considered by Hindus to convey a knowledge[1] eternal, timeless and always contemporaneous with Brahman. This knowledge is considered to have been handed down by realised yogins to students many generations before the vedas were committed to writing. Written texts of the Vedas are a relatively recent phenomenon.

Connected with the ritual of pre-Vedantic Hinduism, Brahman signified the power to grow, the expansive and self-altering process of ritual and sacrifice, often visually realised in the sputtering of flames as they received the all important ghee (clarified butter) and rose in concert with the mantras of the Vedas. Brahmin came to refer to the highest of the four castes, the Brahmins, who by virtue of their purity and priesthood are held to have such powers.

It is the first instance of monism in organized religion. Hinduism remains the only religion with this concept.[original research?] To call this concept 'God' would be imprecise. The closest interpretation of the term can be found in the Taittariya Upanishad (II.1) where Brahman is described in the following manner: satyam jnanam anantam brahman - "Brahman is of the nature of truth, knowledge and infinity". Thus, Brahman is the origin and end of all things, material or otherwise. Brahman is the root source and Divine Ground of everything that exists, and does not exist in Hinduism. It is defined as unknowable and Satchitananda (Truth-Consciousness-Bliss). Since it is eternal and infinite, it comprises the only truth. The goal of Hinduism, through the various yogas, is to realize that the soul (Atman) is actually nothing but Brahman. The Hindu pantheon of gods is said, in the Vedas and Upanishads, to be only higher manifestations of Brahman. For this reason, "ekam sat" (all is one), and all is Brahman. This explains the Hindu view that "All paths lead to the one Brahman, though many sages [and religions] call him different things."

Several mahā-vākyas, or great sayings, indicate what the principle of Brahman is:
prajnānam brahma[2] "Brahman is knowledge"
ayam ātmā brahma[3] "The Self (or the Soul) is Brahman "
aham brahmāsmi[4] "I am Brahman"
tat tvam asi[5] "Thou are that"
sarvam khalv idam brahma[6] "All this that we see in the world is Brahman",
sachchidānanda brahma[7][8] "Brahman is existence, consciousness, and bliss".

Another way to describe Brahman, as mentioned in the Brihadaranyaka Upanisad, is to say, "Brahman is not this.. Brahman is not that.." Until everything in the infinite universe has been eliminated and only Brahman remains -- implying that indeed Brahman in infinite set universes is the empty set. This is often paraphrased as "everything is true of the elements of the empty set." Thus all and none in one that is not but still is everywhere and nowhere in particular.

In terms of astronomical or quantum universes it is referred to as Vacuum -- ever present surrounding all, always within you as it is without you."

en.wikipedia.org/wiki/Brahman