Amen
Archimandrite Nikifor’s Biblical Encyclopedia
(truly, so be it) (Deut. 27:15). This word, though used in various ways, essentially has one and the same meaning. It serves as a confirmation of a reply and is used to express agreement or complete assent. It is sometimes translated by the word “verily,” and was often used by the Lord when He uttered some important and certain truth. The repetition of this word — “verily, verily, I say unto you” — strengthens the affirmation. Among the early Christians it was customary for all present at worship to say “Amen!” at the end of every prayer, or at the giving of thanks (1 Cor. 14:16).
Jewish writers say: there is nothing higher in the eyes of God than the word “amen,” by which an Israelite confirms his word. The promises of God are “amen,” because they have become sure and certain in Christ (2 Cor. 1:20). The word “Amen” serves as one of the titles of our Lord (Rev. 3:14), since He is the faithful and true Witness. The words “Amen and Amen” serve as an eloquent and elevated conclusion to one of David’s solemn songs (Ps. 41 [41]:13 [14]).