He prefers to act actively.

It is important to understand the importance of health.

He is majoring in moral philosophy at university.

He is a famous philosopher.

He is immersed in the study of positivism.

His way of thinking is very philosophical.

He was troubled by the scholasticism.

His success had a cause-and-effect relationship with his efforts.

There is a complex love triangle between them.

This is the book that I am reading.