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Exoteric refers to knowledge that is outside, and independent from, a person's experience and can be ascertained by anyone (related to common sense). It is distinguished from internal esoteric knowledge. "Exoteric" relates to external reality as opposed to a person's thoughts or feelings. It is knowledge that is public as opposed to secret or cabalistic. It is not required that exoteric knowledge come easily or automatically, but it should be referenceable or reproducible.
Most philosophical and religious belief systems presume that reality must be independent of what an individual makes of it. However, even before the days of Plato, a prominent alternate theory of knowledge insisted that the perceived outside reality is merely an internal fabrication of the observer and that it has no existence or substance outside the imagination of the observer. The Buddha's statement: "All that we are arises with our thoughts" (Dhammapada 1.1) is reminiscent of this.
In his book entitled The Book of Five Rings, the Japanese swordsmaster Miyamoto Musashi noted that when he teaches people martial arts, "since [he] generally makes them learn such things as have actual relevance to addressing [deeper principles], there is no such thing as a distinction between the esoteric and the exoteric." 
In the same way as the term "esoteric" is often associated with esoteric spirituality, the term "exoteric" is mostly used in discussions of religion and spirituality, as when the teachings shift the believer's focus away from an exploration of the inner self and towards an adherence to rules, laws, and an individual God.
The term "exoteric" may also reflect the notion of a divine identity that is outside of, and different from, human identity, whereas the esoteric notion claims that the divine is to be discovered within the human identity. Going one step further, the pantheistic notion suggests that the divine and the material world are one and the same.
- Miyamoto Musashi. The Book of Five Rings. Translated by Thomas Cleary. Shambhala Library. Boston & London. 2003. p. 86.
- Esoteric and Exoteric – An article on the use of these terms in mystic and occult literature