Leaving for Iași, the capital of Moldavia, he studied at the Vasilian College and at Academia Mihăileană between 1830 and 1837.
Meanwhile, between 1834 and 1837, he taught at the normal school associated with Trei Ierarhi Monastery and was a part-time teacher at Academia Mihăileană from 1837 to 1839.
He entered Kiev Pechersk Lavra, taking the name Filaret, and was ordained a hieromonk in 1842.
Beginning in 1865, together with his brother Neofit, he was at the forefront of the campaign to obtain autocephaly for his church from the Patriarch of Constantinople.
He authored a number of textbooks, both for secular and theological education, as well as poems and speeches.