He served as a hierodeacon (deacon-monk) when, in 1608, he and a few others joined Job of Manyava to follow him in very strict ascetic practices, and to become monks in seclusion and wilderness of the Carpathian Mountains.
Rumours about his strict and virtuous living spread through the Carpathians, Galicia, Volynia and Northern Bukovina, Moldova, and Romania.
Theodosius' spiritual authority and the strict monastic rules of his community brought about much respect on the part of other Orthodox monasteries in the entire region.
Having contributed much to the welfare of Manyava Skete and many other monasteries, Theodosius died in 1629 and was buried next to his teacher, Job.
The large stone tombstone with an Orthodox cross engraved upon it, that had covered their graves, is kept and venerated in Manyava Skete.