. . "Perennialism" . . . "perennial philosophy" . "all religions are essentially one" . . "Perennial Philosophy" . "perennialist thinker" . . "essentialist" . "encompasses all creeds and all knowledge" . "Sophia Perennis" . . "philosophia perennis" . . "perennialism" . "Perennial philosophy" . "eternal values and principles" . . . "perennialist" . . . . "Perennialist" . . . "Perennial philosophy" . "perennial tradition" . "ageless wisdom" . "neo\u2011perennialism" . "underlying harmony" . . "various traditions" . "perennial" . "Philosophia Perennis" . "perennialist school of thought" . "united search for truth" . . . . . . "perennialist philosopher" . "common mystical language" . "common core" . . "''philosophia perennis''" . "Perennialists" .