A circle is a geometric shape in which all points are equidistant from the center.
I just couldn’t resist. 😉
But seriously… A circle is what members call the meetings they attend, usually weekly. These meetings are designed to teach them the spirit of Opus Dei. They receive talks related to the virtues, or the norms of piety mentioned above, or some other aspect of Opus Dei’s spirit. Part of the circle is an examination of conscience in which a standard set of about 30 questions is asked relating to their spirit. An example would be “Do I always work with the joy of one who knows he is a son of God?” They reflect on each question for a moment in the privacy of their own conscience.
There are circles for each of the types of members, numeraries, supernumeraries and associates. There are also circles for “cooperators,” who are not members of the Work, but who wish to receive some formation in the spirit of Opus Dei. Cooperators are covered in Question 24.