§6. The ancient world introduced its own typical differentiation of people into classes according to the type of work done. Work which demanded from the worker the exercise of physical strength, the work of muscles and hands, was considered unworthy of free men, and was therefore given to slaves. By broadening certain aspects that already belonged to the Old Testament, Christianity brought about a fundamental change of ideas in this field, taking the whole content of the Gospel message as its point of departure, especially the fact that the one who, while being God, became like us in all things devoted most of the years of his life on earth to manual work at the carpenter’s bench. This circumstance constitutes in itself the most eloquent “Gospel of work”, showing that the basis for determining the value of human work is not primarily the kind of work being done but the fact that the one who is doing it is a person. The sources of the dignity of work are to be sought primarily in the subjective dimension, not in the objective one.
John Paul II, Laborem Exercens (Vatican.va)