To resolve controversial issues, councils were organized, in the meetings of which bishops and theologians participated. The first two councils, convened at Nicaea in 325 and at Constantinople in 381, brought the most important tenets of Christianity into a concise Creed. The doctrine that developed at the councils and corresponded to the Symbol of Faith was called orthodox in the Greek language, which translates as “faithful, Orthodox”. The Church called itself Catholic (catholic), which means “universal, universal.” Later, when a split occurred in the Christian Church, the Church of the East began to be called Orthodox, and the Church of the West – Catholic.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.