How does one know that they have salvation? Assurance, the human being’s confidence and conviction that their
sins have been paid, can be best understood by first examining the basis of assurance: the concept of eternal
The concept that Believers can never lose their salvation, eternal security, can be seen in the words of Jesus
who states that all who believe in Jesus will have eternal life:
"He who believes in the Son has eternal life; but he who does not obey the Son will not
see life, but the wrath of God abides on him." (John 3:36)
"Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has
eternal life, and does not come into judgment, but has passed out of death into life."
The apostles attest to the same message:
These things I have written to you who believe in the name of the Son of God, so that
you may know that you have eternal life. (1 John 5:13)
The concept of eternal security also recognizes the entitlement of salvation namely of becoming God’s holy people
and His possession (Ex 19:4-6;
Deut 7:6). The idea that Believers are God’s own possession is
seen in Jesus’ statement about the eternal security of the Old Testament Believer
(see What does it mean "God draws"?):
All that the Father gives Me will come to Me, and the one who comes to Me I will
certainly not cast out. For I have come down from heaven, not to do My own will, but the will of Him who sent Me.
This is the will of Him who sent Me, that of all that He has given Me I lose nothing, but raise it up on the last
day. For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal
life, and I Myself will raise him up on the last day."
But you do not believe because you are not of My sheep. My sheep hear My voice, and I
know them, and they follow Me and I give eternal life to them, and they will never perish; and no one will snatch
them out of My hand. My Father, who has given them to Me, is greater than all; and no one is able to snatch them out
of the Father’s hand. I and the Father are one." (John 10:26-30)
This idea of holy people being God’s own possession is further developed in the New Testament with the sealing
of genuine Christians by the Holy Spirit at initial salvation; God’s pledge and guarantee to the Believer of his
Now He who establishes us with you in Christ and anointed us is God, who also sealed us and
gave us the Spirit in our hearts as a pledge. (2 Cor 1:21-22)
In Him, you also, after listening to the message of truth, the gospel of your salvation—having
also believed, you were sealed in Him with the Holy Spirit of promise, who is given as a pledge of our
inheritance, with a view to the redemption of God’s own possession, to the praise of His glory.
Do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.
The concept of eternal security is objective fact. Assurance is Jesus' guarantee of that fact.
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