How does the symbol of Richard Cory reveal the theme of the poem "Richard Cory"?

The image of Richard Cory, the symbolism of both who he
was and how the town saw him, are of vital importance to the theme of the poem.  The
idea of Richard Cory being someone of respect, and with almost an aura of regalia to him
is essential to understanding what happened to him.  People regarded him in an almost
point of view.  His amassing of wealth cut him off from people and this helped to feed
the perception of him as being someone who "glittered" apart from others.  While this
helped to intensify the way people looked at him, it might hint at the fundamental
sadness that is apparent in his character, causing him to not be able to forge anything
in way of social solidarity with others.  This isolation compelled him to end his life
in the manner he did and cause a level of uncertainty in how he was viewed by others. 
His being "richer than a king" was a symbol of how the town viewed him, but it was also
representative of how alienated Cory was from himself and
others.