  The mathematical logic of a true nature of mirror symmetry expresses, in the
case of the Dirac Lagrangian, the ideas of the left- and right-handed photons
referring to long- and short-lived particles, respectively. Such a difference
in lifetimes says about the photons of the different components having the
unidentical masses, energies, and momenta. This requires the generalization of
the classical Klein-Gordon equation to the case of all types of bosons with a
nonzero spin. The latter together with a new Dirac equation admits the
existence of the second type of the local gauge transformation responsible for
origination in the Lagrangian of an interaction Newton component, which gives
an inertial mass to all the interacting matter fields. The quantum mass
operator and the mirror presentation of the classical Schr\"odinger equation
suggest one more highly important equation. Findings show clearly that each of
the quantum mass, energy, and momentum operators can individually act on the
wave function. They constitute herewith the Euler-Lagrange equation at the
level of the mass-charge structure of gauge invariance.
