At this point, the Lord decides he likes Moses, who says, “Show me, now, Your glory!" But that is too much for G_d, who says, “... for man shall not see Me and live.”
Again, seeing G-d would mean demeaning Him with a definition.
So he tells Moses to step into a cleft of a rock and He will cover Moses with his hand as He moves by.
All my life I've wanted to define things. Black and white. Even words define things. We see a bright red form ... “recognize it” and then call it a name, “apple,” ending our relationship to it.