The document recognizes children's right to freely express their views in all matters affecting them and insists that these views be given due weight in accordance with the age and maturity of the children voicing them (Article 12). It further proclaims children's right to freedom of all forms of expression (Article 13). Children are entitled to freedom of thought, conscience and religion (Article 14), to privacy and protection from unlawful attack or interference (Article 16) and to freedom of association and peaceful assembly (Article 15). The responsibility to secure these conditions lies mainly with parents and guardians, but States parties are obliged to assist and "in case of need provide material assistance and support programmes, particularly with regard to nutrition, clothing and housing."