Final answer:
The sacramental principle refers to the importance and power of the sacraments in Christianity.
Step-by-step explanation:
The 'sacramental principle' refers to the belief in the importance and power of the sacraments in Christianity.
In Christianity, the sacraments are special ceremonies that symbolize and convey divine grace. They include sacraments such as baptism, confirmation, marriage, ordination, and the Eucharist or Communion.
For Catholics and Eastern Orthodox Christians, the sacraments are believed to have a real, transformative effect, while for Protestants and other Christians, they serve as symbolic reminders of spiritual truths.