Passage
Amen, amen, I say to you: If any man keep my word, he shall not see death for ever.
Amen, amen, I say to you: If any man keep my word, he shall not see death for ever.
John 8:49 Jesus answered: I have not a devil: but I honour my Father. And you have dishonoured me.
John 8:50 But I seek not my own glory: there is one that seeketh and judgeth.
John 8:51 Amen, amen, I say to you: If any man keep my word, he shall not see death for ever.
John 8:52 The Jews therefore said: Now we know that thou hast a devil. Abraham is dead, and the prophets: and thou sayest: If any man keep my word, he shall not taste death for ever.
John 8:53 Art thou greater than our father Abraham who is dead? And the prophets are dead. Whom dost thou make thyself?
The verse centers on "amen", "keep", "word", "shall", "death", and "ever". It is saying that the verse draws attention to "amen" and "keep", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 50's "But I seek not my own glory..." into verse 52's "The Jews therefore said Now we know...", so "amen" and "keep" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "amen" and "keep" with trust shaped by these words, not by a vague optimism outside the passage.