Within the domain of an electromagnetic model of matter it is supposed in this article that quantum mechanical probability waves are the observed relativistic effects of (auto-) confined electromagnetic waves. A relativistic coupling in the energy domain of the continuity equation results in the $chrOdinger wave equation, while an extended coupling including the momentum domain (observed as "spin n) results in the Dirac equation. It is demonstrated in Sec. 3 that the (relativistic) Dirac equation presumably originates from the Maxwell equations. Within the scope of this electromagnetic model of matter, "light, ~ or more generally, "electromagnetic radiation, ~ is regarded to be the building material of matter, which is effectively an inversion of the idea that light consists of elementary particles (photons). This postulated concept of inversion is extended to particles with a finite rest mass. The stability conditions for electromagnetic self-confinements (EONs) are obtained by the gravitational or electromagnetostatic forces or a combination of them, controlling the confinement.