[Wikipedia on Perennial philosophy](https://en.wikipedia.org/wiki/Perennial_philosophy): > The perennial philosophy, also referred to as perennialism and perennial wisdom, is a perspective in philosophy and spirituality that views all of the world's religious traditions as sharing a single, metaphysical truth or origin from which all esoteric and exoteric knowledge and doctrine has grown. As in [[The Bhagavad Gita]] and probably [[Meditations]] by [[Marcus Aurelius]] (I mean [[Stoicism]]).