As a Calvinist church, the Presbyterian Church in the USA shared a common theological heritage with other Presbyterian and Reformed churches. The Bible was considered the only infallible source of doctrine and practice. The Presbyterian Church also acknowledged several subordinate standards, the most important being the Westminster Confession of Faith. As part of their ordination vows, ministers and other church officers were required to "sincerely receive and adopt the Confession of Faith of this Church, as containing the system of doctrine taught in the Holy Scriptures". In addition to the Confession of Faith, the Westminster Shorter Catechism and Larger Catechism were also used.