At the end of XIII century and the beginning of the XIV century, hesychasm made its way to these places. Through obedience, abstinence, patience and contemplation of nature, hesychasts aspired to union with God. The first Bulgarian hesychast was Theodosius of Tarnovo. His followers sought solitude in inaccessible areas, away from mundane life. Perhaps this is why these philosophers hermits sought for a retreat in the area off the village of Krushuna, near the Maarata Cave.
The Krushuna temple shows that hesychasts have had certain, albeit empirical, knowledge of geology.
Several monastic cells carved into the almost inaccessible travertine cliffs around the waterfall, laid the foundations of the Krushuna Middle-Age Monastery. Next to the cells or inside them, niches for icons, books, candles were carved in. The central rock church was hewed with an entrance, which has a triangular shape symbolizing the Holy Trinity. The entrance opens up the route for the sacred area in a prayer cell, which shape is like a dome, resembling a church vault. The entrance to a dwelling unit is 243 cm wide and 260 cm deep. In front of the entrance, there is a place carved for an icon and the entrance has grooves where the door used to stand. Another cell has an almost square hole. The entrance next to the base is 110 cm and its height is about 100 cm.
The square is known as a flat model of the world, and the cube carved into the sphere is a model of the kingdom of heaven. The numerical ratio of these elements of symmetry corresponds to the golden proportion and harmony of the musical variety. In these cells lived Hesychasts who were actively performing and directly involved activities related to the traditions of the Tarnovo Literary School. The Krushuna Hesychasts healed sick people, helped the blind to start seeing again. They were participants in a very interesting social experiment aimed at the emancipation of humanity and man’s ills by even denying death. The Hesychast was deeply excited by the problem of death and immortality of a man. According to them, the great man is humble. They believed that humanity needs a revolution of values whose definitive principles would be love, wisdom and truth. They had their followers and fans among the local population. This is shown by numerous enriched niches and shelters carved into the rocks where one could even spend the night in the rain. It is, therefore, appropriate to speak of the Krushuna hesychastic and spiritual centre.