He became a member of the Order of Saint Benedict as a novice of Santa Maria de Montserrat on 6 August 1943.
He became abbot in 1966, to replace Aureli Maria Escarré, who had had to go on exile during Francisco Franco's dictatorship because of some public statements against the regime.
[4] Just gave Montserrat his open-minded and peaceful style, which made him take in believers and non-believers and people from all ideologies in the abbey.
Amongst them were the last three presidents of the Generalitat, Jordi Pujol, Pasqual Maragall and José Montilla;[4] Marius Rubiralta, the vice-chancellor of the University of Barcelona; the former archbishop of Girona, Jaume Camprodon and Josep Caminal, the former director of the Gran Teatre del Liceu.
[7] He believed the sexual morals of the Roman Catholic Church were outdated, and showed a favourable position towards the use of contraceptives.
Cassià Maria also asked the Church to review its positions on homosexuality, euthanasia,[5] and abortion.