LITERATURE: The Unbearable Lightness – Yes, there is so philosophy to be learned in fiction

In bringing in Yakov Stalin–the son of that Stalin, Joseph–as an example of opposites or extremes becoming instead  alike, I come to a place where I must ponder heavy stuff about the "unbearable lightness":

If rejection and privilege are one and the same, if there is no difference between the sublime and the paltry, if the Son of God [young Stalin] can undergo judgment for shit, then human existence loses its dimensions and becomes unbearably light.  (p. 244)

And I sort of halfway understand it.