K. considered mystical religiosity in the Flanders of the thirteenth century in the context of the influence of Hugh of St Victor and Bernard of Clairvaux. According to K., that spiritual movement was most closely associated with Franciscans.

The author studied hagiographic monuments revealing some peculiarities of female medieval monasticism: for example, the life of Ida of Louvain, Ida of Leo, Maria of Oignies, Juliana of Ypres, etc. The specific of positioning of the nun as the bride of Christ was in the imitation of Savior, manifested in fasting and labor. The problem of religious activity is shown as the problem of justification, which is necessary for communion with Christ.

The researcher noted that the mystical theory of Hugh of St. Victor assumed the rejection of the sinful world and considered the ideal that promoted rapprochement with God, the desire for eternal peace and bliss. The same attitude towards the life of St Mary of Oignies could be observed in a hagiographical work compiled by Jacques de Vitry.