Health is very important.

His opinion is very important.

We are all part of the same brethren.

He received the letter challenging him to a duel and began preparing for the duel.

Michael is an important angel in Judaism.

A tesseract is a four-dimensional geometric shape.

A 5-cell is a simple convex polytope in four dimensions.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

He decided to literally change the riverbank in order to change the direction of his life.