Every now and then it would do us good to consider why we use the word Amen when we hear the preacher say something we agree with and that blesses our souls. We find the word used in Isa 65:16 "So that he who blesses himself in the land shall bless himself by the God of truth, and he who takes an oath in the land shall swear by the God of truth; because the former troubles are forgotten and are hidden from my eyes." In the Hebrew the word for truth is literally "Amen". So here it is saying God is a solid foundation and sure; he is utterly reliable.
Jesus is referred to as the Amen in Rev 3:14 "And to the angel of the church in Laodicea write: 'The words of the Amen, the faithful and true witness, the beginning of God's creation." Here we can see that he is referred to by the same name and glory as Yahweh in the OT. It is interesting that when Jesus was about to say something that he wanted to emphasize as very important, so important that you can trust your life on it, he began with the words truly, truly or amen, amen. It is important that we hear the Word with this in mind. When He speaks, we listen; whatever he says is truth. This must be our attitude towards the Bible or we will never understand it or be able to trust it. God speaking always takes precedent over our teachers, parents or whatever weird thoughts pop into our mind.
But when we use the word "amen" we use it after God has spoken. He proclaims what is true and we acknowledge his words as true. We agree with God, confessing his words as truth. We see this happening in Rev 5:13 And I heard every creature in heaven and on earth and under the earth and in the sea, and all that is in them, saying, "To him who sits on the throne and to the Lamb be blessing and honor and glory and might forever and ever!" Rev 5:14 And the four living creatures said, "Amen!" and the elders fell down and worshiped.
When we by faith believe and obey what he has said, it will take root in us and produce godliness in us. There is much in this world I do not understand, much that I am unsure of and nothing that I am willing to stake my life on. But by faith I will stake my life on what God says even those things that I don’t fully understand. When he says there is none righteous, no not one; I live my life standing on that truth. When he says “no man cometh unto the Father but by me”, then that settles in my mind concerning the broad ways that men have come up with. He says that he created all things out of nothing by the word of his power and so I can walk into the classroom already with more understanding of the origins of the universe than those who will not listen. Let’s set the Word of our Lord as the foundation of how we think and live and see how he will work through us. Amen!