Question #92
of An Orthodox Catechism
Question
You told us but now, that those who in Confession and Life declare themselves to be Infidels, profane and ungodly, should by the Keys of the Kingdom of Heaven be driven from this Supper: what are the Keys of the Kingdom of Heaven?
Answer
Preaching of the Gospel and Ecclesiastical Discipline, by which Heaven is opened to the Believers, and1 is shut against the Unbelievers.