The Hebrew term amēn (truly) in John

(Translation from NRSV for the New Testament with a few modifications for a more literal meaning)

Legend:
Blue color: amēn = outcome of faith in Jesus
Green color: amēn = teaching on spiritual life
Pink color: amēn = revelation on the human heart
Red color: amēn = teaching on Jesus himself

John

1: 51And he said to him, "Truly (amēn), truly (amēn), I tell you, you will see heaven opened and the angels of God ascending and descending upon the Son of Man."
3: 3Jesus answered him, "Truly (amēn), truly (amēn), I tell you, no one can see the kingdom of God without being born from above."
3: 5Jesus answered, "Truly (amēn), truly (amēn), I tell you, no one can enter the kingdom of God without being born of water and Spirit.
3: 11"Truly (amēn), truly (amēn), I tell you, we speak of what we know and testify to what we have seen; yet you do not receive our testimony.
5: 19Jesus said to them, "Truly (amēn), truly (amēn), I tell you, the Son can do nothing on his own, but only what he sees the Father doing; for whatever the Father does, the Son does likewise.
5: 24Truly (amēn), truly (amēn), I tell you, anyone who hears my word and believes him who sent me has eternal life, and does not come under judgment, but has passed from death to life.
5: 25"Truly (amēn), truly (amēn), I tell you, the hour is coming, and is now here, when the dead will hear the voice of the Son of God, and those who hear will live.
6: 26Jesus answered them, "Truly (amēn), truly (amēn), I tell you, you are looking for me, not because you saw signs, but because you ate your fill of the loaves.
6: 32Then Jesus said to them, "Truly (amēn), truly (amēn), I tell you, it was not Moses who gave you the bread from heaven, but it is my Father who gives you the true bread from heaven.
6: 47Truly (amēn), truly (amēn), I tell you, whoever believes has eternal life.
6: 53So Jesus said to them, "Truly (amēn), truly (amēn), I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.
8: 34Jesus answered them, "Truly (amēn), truly (amēn), I tell you, everyone who commits sin is a slave to sin.
8: 51Truly (amēn), truly (amēn), I tell you, whoever keeps my word will never see death."
8: 58Jesus said to them, "Truly (amēn), truly (amēn), I tell you, before Abraham was, I am."
10: 1"Truly (amēn), truly (amēn), I tell you, anyone who does not enter the sheepfold by the gate but climbs in by another way is a thief and a bandit.
10: 7So again Jesus said to them, "Truly (amēn), truly (amēn), I tell you, I am the gate for the sheep.
12: 24Truly (amēn), truly (amēn), I tell you, unless a grain of wheat falls into the earth and dies, it remains just a single grain; but if it dies, it bears much fruit.
13: 16Truly (amēn), truly (amēn), I tell you, servants are not greater than their master, nor are messengers greater than the one who sent them.
13: 20Truly (amēn), truly (amēn), I tell you, whoever receives one whom I send receives me; and whoever receives me receives him who sent me."
13: 21After saying this Jesus was troubled in spirit, and declared, "Truly (amēn), truly (amēn), I tell you, one of you will betray me."
13: 38Jesus answered, "Will you lay down your life for me? Truly (amēn), truly (amēn), I tell you, before the cock crows, you will have denied me three times.
14: 12Truly (amēn), truly (amēn), I tell you, the one who believes in me will also do the works that I do and, in fact, will do greater works than these, because I am going to the Father.
16: 20Truly (amēn), truly (amēn), I tell you, you will weep and mourn, but the world will rejoice; you will have pain, but your pain will turn into joy.
16: 23On that day you will ask nothing of me. Truly (amēn), truly (amēn), I tell you, if you ask anything of the Father in my name, he will give it to you.
21: 18Truly (amēn), truly (amēn), I tell you, when you were younger, you used to fasten your own belt and to go wherever you wished. But when you grow old, you will stretch out your hands, and someone else will fasten a belt around you and take you where you do not wish to go."