Augustine's influence on baptismal theology extended in an other direction. In his battles with the Donatists (who insisted that only holy men could celebrate authentic sacraments). Augustine insisted that the source of sacraments is God, not the minister. Sacraments are not contingent on the moral character or even beliefs of the minister but receive their efficacy from God alone. The Donatists had rightful sacraments even though they held them unrightfully which interfered with their efficacy. Hence rebaptism, which had been advocated earlier in North Africa by Cyprian, could not be practiced. This is of enormous ecumenical significance in our times, for it means cross-denominational acceptance of each others' baptism