philosophia perennis

noun

phil·​o·​so·​phia pe·​ren·​nis

ˌfiləˈsōfēəpəˈrenə̇s

sometimes capitalized both P's

: a group of universal philosophical problems, principles, and ideas (as concepts of God, freedom, and immortality) that perennially constitutes the primary subject matter of philosophical thought : the foundations of Roman Catholic Christian principles especially as philosophically formulated by St. Thomas Aquinas and Neothomists

some Philosophia Perennis which would be agreed on in advance as a sort of intellectual base of operations

—H. D. Aiken

Word History

Etymology

New Latin, literally, perennial philosophy

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