Pope John XXIII
Mater et Magistra §92
Mater et Magistra: On Christianity and Social Progress
92 This demands that the relations between management and employees reflect understanding, appreciation and good will on both sides. It demands, too, that all parties co-operate actively and loyally in the common enterprise, not so much for what they can get out of it for themselves, but as discharging a duty and rendering a service to their fellow men.
Source: Mater et Magistra (Vatican.va)