Through Work man must earn his daily bread and contribute to the continual advance of science and technology and, above all, to elevating unceasingly the cultural and moral level of the society within which he lives in community with those who belong to the same family. And work means any activity by man, whether manual or intellectual, whatever its nature or circumstances; it means any human activity that can and must be recognized as work, in the midst of all the many activities of which man is capable and to which he is predisposed by his very nature, by virtue of humanity itself.