Quakers reject the idea of priests, believing in the priesthood of all believers. They tend to be Christian, practicing as Orthodox Christians or Old Believers. They called themselves Christians, or "True Believers". Churches of Christ hold to the priesthood of all believers. This investigation found that approximately 80% of persecuted believers worldwide are Christians. These values can be resources for finding common ground between believers and nonbelievers. Prayer plays a significant role among many believers. The invisible church is the body of all believers, known only to God. Verses 14 and 15 each mention groupings of believers and saints. To know Christ is only half of what the believers need. This view stems from a highly developed concept of the priesthood of all believers. Believers and disbelievers were each shown descriptions of ESP experiments. Khadijah is often referred to by Muslims as "Mother of the Believers". Vertov surrounded himself with others who were also firm believers in his ideas. And the peace of the believers shall be one.