What does it mean to “. . . see through a glass darkly. . . .”?

The word “glass” in this verse comes from the original Greek word ἔσοπτρον which actually means “mirror” (Source). The word “darkly” doesn’t seem to have anything to do with light and everything to do with position. It comes from the Greek word ἐν which means a fixed position (Source).  So seeing through a glass darkly perhaps means that we see ourselves from a fixed, earth-focused perspective instead of seeing ourselves the way God does. 

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