The Lagrangian is a simple statement of the energy of a system. Have you heard of the relationship between energy and time? Have you heard of the principle of

The Lagrangian is a simple statement of the energy of a system. Have you heard of the relationship between energy and time? Have you heard of the principle of least time for photons? Have you considered that a "photon" is not a wave or particle of energy before it is detected, but rather the probability that one will be detected?