The constant faith of the Church has been consistent in the
teaching about the sacraments.
1st - 6th century
Church Fathers (from Christian antiquity until Clement of
Alexandria (Athens, 150 - 215 AD) and Origen (Alexandria,
185 - 254 AD)) used the words sacramentum and mysterion
to describe these hidden and holy things in the life of the
church.
 
16th century
The Council of Trent (1545 - 1563) defined sacraments as
symbols of holy and invisible graces in visible form. This
definition is found in the works of Augustine (Numidia,
now Algeria, 354 - 430 AD).