Recognising his artistic talent, Professor Costin Petrescu entrusted him with the painting of a depiction of Mihai Viteazul for the Romanian Athenaeum.

On his return, he joined the Brâncoveanu Monastery at Sâmbăta de Sus, Brașov County, where he took his vows and was tonsured into monasticism in 1940.

He helped theologian Dumitru Stăniloae from Sibiu with the translation into Romanian of the first volumes of the Philokalia, a collection of early Church Fathers and monastics in the hesychast tradition.

In 2018, the novelist Tatiana Niculescu claimed that he was an adept of Anthroposophy, a spiritual movement initiated by the Austrian occultist Rudolf Steiner,[3] which, she said, influenced Boca's paintings at the church at Drăgănescu, wherein the spectre of Jesus Christ rises from the rock covering the grave.

[5] After World War II, he was arrested in July 1945 in Râmnicu Vâlcea by the Siguranța secret police and detained for several days.

[2] Once the Romanian People's Republic was installed in Romania, Boca was persecuted by the authorities and the regime's secret police, the Securitate.

He was arrested and imprisoned several times for allegedly helping the Romanian anti-communist resistance movement (fascists).

However, the Orthodox Church has never made any official ruling on Francis of Assisi, and so some regard this iconographic depiction as legitimate.