A Concise Theory of Truly Everything represents the vanguard of the long-promised future of existential thought in which contemporary science, philosophy, and spirituality naturally converge to provide a rational explanation of our ontological origin, intrinsic purpose, and ultimate destiny. It uses the pillars of modern science to inform a metaontological application of modal logic to the principles underlying transcendental idealism, from which emerges the profound spiritual insights that form the basis of our most enduring religious traditions. This book logically solves fundamental mysteries within each of our existential frameworks using an accessible vocabulary that remains consistent with their complementary core principles.

A Concise Theory of Truly Everything presents a comprehensive existential framework called modal idealism, in thirty-six principles—including thirteen brute facts—that philosophically integrate mainstream science and spirituality to produce rational answers to what it characterizes as the Seven Theory of Truly Everything Questions:

1. 1. Why is there something rather than nothing?
   2. How did the universe come to be?
   3. Does God exist?
   4. Do we have free will?
   5. Why is there evil and suffering in the world?
   6. Do we have an intrinsic purpose?
   7. Is there life after death?

The corresponding answers reflect a logical reality in which existence can be meaningful and purposeful without being irrational. They are complete objective answers rather than the usual subjective hints and suggestions that invariably prompt more questions.

Until now, only scientific, philosophical, and spiritual specialists have had unmediated access to existential knowledge. A Concise Theory of Truly Everything (ACToTE) democratizes these foundational insights by bridging the gap between its readers and the wisdom underlying: animism, Hinduism, Judaism, Buddhism, Taoism, Platonism, Aristotelianism, Christianity, Islam, the Galilean-Baconian method, Cartesian dualism, Newtonian-Lagrangian-Hamiltonian mechanics, Kantian transcendental idealism, Hegelian dialectics, the theory of evolution, Cantorian transfinite numbers, quantum mechanics, the theories of general and special relativity, existentialism, possible world semantics, and the Standard Models of particle physics and cosmology, in a compellingly comprehensible format.