Again, Cassian, you just go on & on, up and saying things without any proof at all. God's word is like a fire and like a hammer that breaks the bones. Man's word proves nothing. It is straw of man.
Guarantees:
Sirs, what must I do to be saved?
Believe on the Lord Jesus Christ and you shall be saved.
Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.
These things have I written unto you, that ye may know that you have eternal life, even unto you who believe on the name of the Son of God.
"I am the way, the truth, and the life."
"The elder unto the elect lady and her children, whom I love in truth; and not I only, but also all they that know the truth; for the truth’s sake which abides in us, and it shall be with us for ever: "
For by one offering he has perfected forever them who are sanctified.
Every one that commits sin is the bondservant of sin. And the bondservant abides not in the house forever: the son abides forever. If therefore the Son shall make you free, ye shall be free indeed.
And I will pray the Father, and he shall give you another Comforter, that he may be with you forever
The eternal God is thy dwelling-place,
And underneath are the everlasting arms.
And the witness is this, that God gave to us eternal life, and this life is in his Son. He who has the Son has the life; he that has not the Son of God has not the life.
Now our Lord Jesus Christ himself, and God our Father who loved us and gave us eternal comfort and good hope through grace, comfort your hearts and establish them in every good work and word.
These things spake Jesus; and lifting up his eyes to heaven, he said, Father, the hour is come; glorify thy Son, that the Son may glorify thee: even as thou gavest him authority over all flesh, that to all whom thou hast given him, he should give eternal life. And this is life eternal, that they should know thee the only true God, and him whom thou didst send, even Jesus Christ.
Cassian, I commend you for hitting the nail on the head by raising that most important issue: namely that what is the ultimate blessing is having communion with the Lord Jesus forever. And "knowing Christ" implies that.