This refers to the way that some people perform an activity not for instrumental reasons such as money or fame, but for its own sake.

Belief in one's abilities to perform an activity comes through successful experience and may add to, or consolidate, a general sense of self-confidence.

Until the time of the illustrations, he was the equivalent of a historian and occupied this as an official function to perform this activity properly.

Students who have been expelled are no longer eligible to visit the school and attend or perform any activity with any students or staff who are with the school.

You will retain oversight control; however, you will not perform any activities relating to the advertising or liquidation of the tracts.