No, we don't. We only have first-order knowledge of our perceptions of things. And quantum mechanics shows us that those perceptions can be radically different from the underlying reality.
Of course, Einstein can be forgiven for making this mistake because he didn't know about the Bell inequality and the subsequent experiments, so it is understandable that he would cling to the hope that something would come along and rescue QM from the EPR paradox by somehow extracting classical reality from the Schroedinger equation. But modern thinkers cannot be so readily absolved.
No, we don't. We only have first-order knowledge of our perceptions of things. And quantum mechanics shows us that those perceptions can be radically different from the underlying reality.
Of course, Einstein can be forgiven for making this mistake because he didn't know about the Bell inequality and the subsequent experiments, so it is understandable that he would cling to the hope that something would come along and rescue QM from the EPR paradox by somehow extracting classical reality from the Schroedinger equation. But modern thinkers cannot be so readily absolved.