Spiritual fatherhood and ministry
At the Monastery of Saint David, Iakovos was remembered above all as a confessor and spiritual father. Having found the monastery in severe disrepair, he gave himself to its restoration through prayer, fasting, and manual labour, and gradually drew to it a steady stream of pilgrims seeking confession and counsel.
Though he suffered from chronic illness, he received visitors of every condition—ordinary villagers alongside professors, bishops, and patriarchs—and was widely regarded in Greece as one of the foremost elders of his generation. Sources preserve his counsel that the world's deepest need is not for material things but for love freely given.
Traditional accounts of his gifts
By tradition, Iakovos was credited with clairvoyance, with visions during the Divine Liturgy, and with conversations with the saints, among them Saint David the Elder, the founder of his monastery, and Saint John the Russian. He was also remembered for performing exorcisms, invoking the relic of Saint David the Elder.
From childhood, traditional accounts relate, he showed exceptional piety—memorizing the Divine Liturgy by the age of seven despite being illiterate, and earning from his fellow villagers the nickname 'the monk.' These accounts are transmitted within the monastery's tradition and the devotion of those who knew him rather than as documented record.
Veneration and glorification
Following his repose in 1991, devotion to Elder Iakovos spread rapidly, and the Monastery of Saint David gathered a large number of testimonies—reported in the hundreds—of healings and answered prayers attributed to his intercession.
In 2017 the Ecumenical Patriarchate of Constantinople formally glorified him, numbering him among the saints with a feast on 22 November; the celebration was headed by Ecumenical Patriarch Bartholomew at the Monastery of Saint David on Evia, concelebrated by bishops of the Churches of Constantinople, Greece, and Cyprus. He has since been named patron saint of the Greek Orthodox Metropolis of New Jersey in the United States.