Here's a very good article (A Philosophical Proposal for the Sanctification of Work) by Maria Pia Chirinos of the Pontifical University of the Holy Cross. Excerpts:
"Although the newness of this message has already been the object of a number of insightful studies, it is worthwhile considering once again the cultural parameters that made it hard for people to grasp the unity between work, virtue and contemplation during the early decades of the twentieth century.
A first answer comes from the history of Catholic spiritual theology. It is here that the separation (and at times the opposition) between the contemplative and active life presented a strong impediment to accepting this innovation. At the same time, it is also true that the topic of work had already found an echo in the concern of the Church’s magisterium for social questions. Nevertheless, although the timeliness of the topic of work was clear, the cultural parameters also included philosophical, economic and social outlooks that impeded a positive approach to work and an adequate anthropological grounding."