How do we know what is real? A thing is real when it resists disorder and we can perceive it and measure it. Substance has mass and is subject to the laws of physics. Particles with mass cannot travel at the speed of light. The speed of light is a constant [and the speed limit of reality]. We can use that constant to measure the energy of mass, or an object's gravity. Resistance to disorder creates gravity. It comes in different forms: weak, strong, electromagnetic, and relative gravity. Substance is nothing without resistance. Atoms hold themselves together and resist chaos. They are put in order by the will of the Higgs field. Simply put, gravity is the act of the universe holding itself together. There is no chaos at the atomic level of reality. Evil (disorder/chaos) has no meaning outside of our perception. The universe governs itself perfectly. That is why e=mc2. Energy equals mass times the speed of light squared. If something lost its fundamental atomic order (which is impossible), it would cease to exist. Without gravity, there is no reality.