2 CORINTHIANS 1
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19 For the Son of God, Jesus Christ, who was preached among you by us, even by me and Silvanus and Timotheus, was not yea and nay, but in him was yea.
20 For all the promises of God in him are yea, and in him Amen, unto the glory of God by us.
All the promises of the Deity in Jesus are the Amen. This is the definition of the individual Amen contained in this passage from Paul.
Now, if only some promises were fulfilled in Jesus, such as those pertaining to the sufferings of the Anointed One; and some others, such as those relating to the good things promised to Judah, Israel, and Jerusalem, and the glory consequent thereon, are never fulfilled in and through him, then, instead of Jesus being "the Amen," he would be "the yea and the nay;" and if the promises concerning the sufferings and glory are not at all fulfilled in him, then he would be "the Nay." But some have been fulfilled in him, and all the rest of the promises will yet be accomplished in him, and therefore he is "the yea," and to Amhn, "the Amen," or the truth and faithfulness itself.
When, therefore, the glorified Jesus says to the Star-Angel Presbytery of the ecclesia of the Laodiceans, and through it to all that generation of ecclesias, and to us of these later times in fellowship with them through belief of the same things they received -- when He says, he is "the Amen," it is equivalent to saying, that all the promises not fulfilled in his first coming, will assuredly be accomplished when he comes again; and that this advent with glory is as certain as the existence of the Deity, which none but a fool would call in question.