The property of religious bodies and religious associations shall be guaranteed, as also their rights in respect of their institutions, foundations, and other funds devoted to worship, education, and social welfare.[40] ARTICLE 139. Sundays and feast days recognised by the State are maintained as holidays and days of spiritual refreshment. ARTICLE 140. Men on military service must be granted sufficient free time to fulfil their religious duties. ARTICLE 141. In so far as a need of religious services and of religious ministration makes itself felt in the army, in hospitals, prisons, or other public institutions, admission shall be accorded to religious associations, but in this there shall be no compulsion. SECTION IV SCHOOLS AND EDUCATION ARTICLE 142. Art, knowledge, and their instruction are free. The State guarantees to protect them and co-operates to promote them. ARTICLE 143. The education of youth is provided for in public institutions established by the Realm, the Lands, and Local Authorities in conjunction. The training of teachers shall be uniformly regulated for the whole Realm on the general lines laid down for higher education. Teachers in public schools have the rights and duties of State officials. ARTICLE 144. All education is under State supervision, in which the State may associate the Local Authorities. Such supervision is exercised by senior officials with special training. ARTICLE 145. Education is universally compulsory. It is effected in elementary schools, with at least eight years' attendance, and in continuation schools, up to the completed eighteenth year. Education and educational apparatus in elementary and continuation schools are free of charge. ARTICLE 146.[41] Public education shall be organically developed. The foundation school, which shall be common to all, shall lead on to the secondary and higher school system. This organisation shall keep in view the variation of vocations; and admission to schools shall have in view the capacities and inclinations of the child, and not the financial or social position of its parents or their religious beliefs. Nevertheless, on demand of the parents or guardians, elementary schools for their particular religious faith or their particular views shall be set up within a municipality, always provided that the regular school programme in the sense of Clause 1 be not hereby prejudiced. The wishes of parents and guardians shall be considered as far as possible. The Land Legislatures shall provide further, subject to the general principles of an act of the Realm. Realm, Lands, and Local Authorities shall provide funds to enable poorer members of the community to attend the secondary and higher schools; in particular, they shall provide maintenance grants for the parents of children who are deemed suitable to receive further education in the secondary and higher schools for the period of such education. ARTICLE 147.