What is the theme in The Rainbow by D. H. Lawrence?

As Lawrence's characters, like their author, are consciously or unconsciously on a quest to connect the various dimensions of their lives in a period of great social upheaval, themes are strongly related to social concerns. The struggle of the major characters to achieve fulfilling personal relationships, satisfying work, and a sense of connection to life which is often seen as religious whether or not connected to a formal religion, are dominant themes.