Unseen Forces is an essay or lecture by Manly P. Hall, a Canadian-born mystic, philosopher, and author, best known for his work on esoteric philosophy and mysticism. Hall authored numerous books, with The Secret Teachings of All Ages being his most celebrated work.In Unseen Forces, Hall explores the subtle, invisible energies and influences that shape human experience and the world at large. These "forces" are often interpreted in the context of metaphysical or spiritual frameworks.