Basic Considerations on the Interpretation of Quantum Mechanics A. Einstein (10)

In my opinion, it is in principle not satisfying to base physics on such a theoretical attitude, especially since the objective describability of the individual macro systems (description of the "real state") cannot be dispensed with without the physical view of the world dissipating into a fog, so to speak. Ultimately, the view that physics must strive for a real description of the individual system is inevitable. Nature as a whole can only be thought of as an individual (uniquely existing) system and not as a "system universe."