In "On the Abrogation of the Private Mass", in the summer of 1521, Luther widened his target from individual pieties like indulgences and pilgrimages to doctrines at the heart of Church practices. His essay "Concerning Confession" rejected the Roman Catholic Church's requirement of confession, although he affirmed the value of private confession and absolution. In the introduction to his New Testament — published in September 1522 and selling 5,000 copies in two months — he explained that good works spring from faith; they do not produce it.