至聖三者聖セルギイ大修道院
In 1987, he was tonsured a monk (as Diomid) at the Trinity Lavra of St. Sergius north of Moscow by Archimandrite Alexis (Kutepov) (now Metropolitan of Tula and Efremov). Diomid completed study at the Moscow Theological Seminary in 1989 and began studies at the Moscow Teological Academy that same year, completing study there in 1993.