Fundamental texts about spiritual exercices (fasting, abstinence, etc.):

- the "Ecclesiastica Officia" of the Cistercian Order,

- the "Instituta" and "Statuta" of the Cistercian general chapter,

- the "Liber usuum" or "Rituale cisterciense",

- the "Constitutions" or "Declarations" of the Cistercian Order.