Тhis paper focuses on the philosophical issue known as the metaphysics of the heart within
Orthodox Christianity – both Russian and Byzantie versions. Russian religious thought is based on patristic tradition. Influences and connections can be seen in Florensky’s philosophy of All-Unity. This Russian philosopher was highly inspired by Gregory Palamas, fourteenth-century Eastern Church. These two Orthodox thinkers, mainly their metaphysics of heart are objects of interests.