The Creeds and Confessions of the (Christian) Church are brief works that explain Christian doctrine briefly, and accurately.
Some confessions of faith from the early Christian reformation include:

Martin Luther's 95 Theses (1517 ad)
Augsburg Confession (1530 ad)
Belgic Confession (1561 ad)
Heidelberg Catechism (1576 ad)
Canons of Dort (1619 ad)
Westminster Confession of Faith (1647 ad)