Above all, we find him continually challenging settled ideas, especially his own.

Chess is one of the oldest games to continually challenge the human mind.

The set documents a great musical mind continually challenging itself.

Our school is continually challenged to provide state-of-the-art training for its students.

Cathedral has made great progress but is continually challenged to do more.

Yet, reality, from one crisis to the next, continually challenges this belief.

The students can be continually challenged in designing, building and fixing their cars.

"I continually challenge that in every way I can, without having to give up being a guy with guitar."

Until recently, however, researchers did not ask whether that was because the 20 percent were healthy or because they continually challenged themselves.

Your proposal is a set of preconceptions that you must continually challenge.