The word esoteric simply means “hidden.” Anything unseen is hidden; this includes parallel dimensions, non-physical beings, spiritual forces, mystical states and experiences, grades of spiritual development and more.
There have always been those who have explored the hidden realms of existence through metaphysical techniques, such as out-of-body experiences, concentrated visualization, and the development of extra-sensory perceptions.
This knowledge has been expressed in sacred texts and symbols throughout the world, often being difficult if not impossible to comprehend by those without the same shared metaphysical experience.
Knowledge of hidden realities has been sought out by both those wishing to use it for sinister purposes and those wishing to use it for spiritual purposes, which doesn’t reflect on knowledge itself. Knowledge is just knowledge; it’s all about how it’s used, and the kind of knowledge that is sought out. Here, we seek out knowledge of the light and use it for the betterment of humankind.