The electromagnetic potentials A satisfy the wave equation from quantum mechanics (D'Alembert's equation). Thus, the Einstein equations shall be considered is background for Quantum Field Theory (QFT). The wave-function A exists only on paper, and when there is demand for particle, then the particle emerges out of nothing. Therefore, the spacetime of the wave function shall remain flat: there is no matter T=0. Therefore, in distant cosmos the spacetime is flat. That certainly would be detected in observable cosmos. It is not the case. Thus, the General Relativity and QFT are not compatible. The way out of paradox is accepting the reality of particles. Therefore, in case of photons the stress-energy tensor of a single photon must be found. That of cause means, that the nature and all inner structure of micro-particles are taken into account. However the inner structure of particles has been derived using the QFT. The Einstein was worried, that the Science has been gone into mathematical fog. The loosing of QFT illusion means the return to Newton laws and Newton's faith in God's Grace, thus away from mathematical solipsism.