What are the motifs in The Wings of the Dove by Henry James?

Selfishness, in varying amounts, appears to be a basic part of human nature. Most balanced individuals behave in both selfish and unselfishness ways, but do not allow their selfishness to harm others if that can be avoided. In The Tale of the Dove, James treats this character trait in a variety of ways, through the characters he has fashioned. Perhaps at the extreme of selfishness is Lord Mark, a man who is willing to seek marriage with two women for the purpose of improving his financial state. When he discovers that Kate is in love and secretly engaged to Densher, he selfishly reveals this information to Milly, disregarding the impact that it may have on her health, in the hopes that she will accept his proposal.