The unification of mass-gravitational and electromagnetic forces presents a profound challenge in physics. This article delves into the intricate relationship between these forces, exploring how they intertwine and influence each other. By examining the principles of spacetime curvature and the Equivalence Principle, we uncover the fundamental nature of mass and its interplay with electromagnetic forces. The philosophical definition of time and space, as well as the mathematical framework of natural units, provide a foundation for understanding the equivalence of energy and mass. This leads to the derivation of a new wave equation and the re-evaluation of the Equivalence Principle, paving the way for a unified field equation that encompasses all four fundamental forces. The exploration of inertial mass statistics in spacetime and the evolution of the particle wave equation further reinforces the interconnectedness of these forces. The analysis of the gravitational field equation and the unification of general relativity with quantum mechanics offer a comprehensive understanding of the physical rules governing photons, black holes, and celestial bodies. This article concludes by emphasizing the importance of simplicity in physical principles and the need for a unified quantum field theory that encompasses the entire universe.