He has a deep interest in abstract art.

He chose a life of asceticism.

My sister decided to become a vegetarian.

Leninism is a form of communism that particularly emphasizes workers' rights.

He is deeply involved in the study of Islamism.

He is deeply interested in mysticism.

He believes in the philosophy of absolutism.

Constructivism is an educational theory that knowledge is actively constructed by each learner.

He is reputed to be a person who sticks to dogmatism.

Imperialism has played a significant role in history.