He is leading a life of hedonism.

He is leading a hedonistic lifestyle.

He is deeply interested in mysticism.

He goes to an evangelical church.

He is opposed to an authoritarian government.

He is a pessimist, always looking at the bad side of the world.

He believes in the philosophy of absolutism.

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

He always tackles things with an optimistic spirit.

He is a believer in inclusionism, thinking that all people should be treated equally.