The perennial philosophy (Latin: philosophia perennis), also referred to as perennialism and perennial wisdom, is a school of thought in philosophy and spirituality that posits that the recurrence of common themes across world religions illuminates universal truths about the nature of reality, humanity, ethics, and consciousness. Some perennialists emphasize common themes in religious experiences and mystical traditions across time and cultures; others argue that religious traditions share a single metaphysical truth or origin from which all esoteric and exoteric knowledge and doctrine have developed.
Perennialism has its roots in the Renaissance-era interest in neo-Platonism and its idea of the One from which all existence emerges. Marsilio Ficino (1433–1499) sought to integrate Hermeticism with Greek and Christian thought, discerning a prisca theologia found in all ages. Giovanni Pico della Mirandola (1463–1494) suggested that truth could be found in many—rather than just Biblical and Aristotelian traditions. He proposed a harmony between the thought of Plato and Aristotle and saw aspects of the prisca theologia in Averroes (Ibn Rushd), the Quran, Kabbalah, and other sources. Agostino Steuco (1497–1548) coined the term philosophia perennis.
Esoteric interpretation of the Quran (Arabic: التأويل الباطني للقرآن, romanized: attaʾwīl al-bāṭinī li-l-qurʾān) is the allegorical interpretation of the Quran or the quest for its hidden, inner meanings. The Arabic word taʾwīl was synonymous with conventional interpretation in its earliest use, but it came to mean a process of discerning its most fundamental understandings. "Esoteric" interpretations do not usually contradict the conventional (in this context called "exoteric") interpretations; instead, they discuss the inner levels of meaning of the Quran.
The Arabic words taʾwīl and tafsīr both mean roughly "explanation, elucidation, interpretation, and commentary"; but from the end of the 8th century CE onwards, taʾwīl was commonly regarded as the esoteric or mystical interpretation of the Quran, while the conventional exegesis of the Quran was referred to using the term tafsīr. The term batin refers to the inner or esoteric meaning of a sacred text, and zahīr to the apparent or exoteric meaning. Esoteric interpretations are found in the Shīʿa, Sufi, and Sunnī branches of Islam and their respective interpretations of the Quran. A ḥadīth report which states that the Quran has an inner meaning, and that this inner meaning conceals a yet deeper inner meaning, and so on (up to seven successive levels of deeper meaning), has sometimes been used in support of this view.
Batiniyya (Arabic: باطنية, romanized: Bāṭiniyyah) refers to groups that distinguish between an outer, exoteric (zāhir) and an inner, esoteric (bāṭin) meaning in Islamic scriptures.
Ẓāhir or zaher (Arabic: ظاهر) is an Arabic term in some tafsir (interpretations of the Quran) for what is external and manifest. Certain esoteric interpretations of Islam maintain that the Quran has an exoteric or apparent meaning, known as zahir, but also an underlying esoteric meaning, known as batin (baten), which can be interpreted only by a figure of esoteric knowledge. For Shi'a Muslims, the Imam of Time alone can understand the esoteric meaning.
In Sufism, the actions of an individual are the zahir, and the intention in the heart is the batin. Zahir is the world of bodies whereas batin is the world of souls. Sufis believe in the purification of the batin by their spiritual guide to assure a zahir that follows Shariat.
Esoteric Christianity is a mystical approach to Christianity which features "secret traditions" that require an initiation to learn or understand. The term esoteric was coined in the 17th century and derives from the Greek ἐσωτερικός (esōterikos, "inner"). It stands in contrast to exoteric (ἐξωτερικός, exōterikos, "outer" or "public"), a distinction already noted by Aristotle, who referred to ἐξωτερικοὶ λόγοι ("exoteric discourses") intended for a general audience. Esoteric teachings were often transmitted orally to a small inner circle of initiates rather than through written publications, a pattern consistent with other religious "secret traditions".
Scholars note that esoteric Christian movements often emphasize alternative interpretations of Christian theology that differ from established orthodoxy. These currents frequently draw upon the canonical gospels, apocalyptic writings, and certain New Testament apocrypha as sources of hidden or symbolic meaning. Some traditions also refer to the disciplina arcani, a concept describing secret teachings or liturgical practices transmitted in the early Church, although mainstream scholarship generally understands it as limited to liturgical secrecy rather than esoteric doctrine.