"But know that the LORD has set apart the godly man for Himself;
The LORD hears when I call to Him." Psalm 4:3
 
There are some Christians who are not sure of their salvation because they
do not feel saved. There are some Christians who believe that they can lose
their salvation. Scripture is very clear on both counts.
 
John 3:16 (we all know it so well) says in The Amplified Bible,
"For God so greatly loved and dearly prized the world that He [even] gave
up His only begotten (unique) Son, so that whoever believes in (trusts in,
clings to, relies on) Him shall not perish (come to destruction, be lost)
but have eternal (everlasting ) life." 
Nowhere in the verse does it relate to our feelings.
 
Believe in John 3:16 in the Greek is PISTEUO. "Vine's Expositive
Dictionary" defines it: 'to believe, also to be persuaded, and hence to
place confidence in, to trust, signifies, in this sense of the word,
reliance upon, not mere credence.'
 
Ephesians 1:3-14 alone should give be the assurance of salvation to all
Believers!
We were chosen by the Father (Read Vs. 3-6):
"Just as He (Father) chose us in Him (Christ) before the foundation of the
world, that we should be holy and without blame before Him in love, having
predestined us to adoption as sons by Jesus Christ to Himself." Vs. 4-5
 
We have been redeemed by the Son (Read Vs. 7-12):
"In Him we have redemption through His blood, the forgiveness of sins,
according to the riches of His grace which He made to abound toward us in
all wisdom and prudence (understanding), having made known to us the
mystery of His will, according to His good pleasure which He purposed in
Himself." Vs. 7-9
 
We are now sealed by the Holy Spirit:
"In Him you also trusted, after you heard the word of truth, the gospel of
your salvation; in whom also, having believed, you were sealed with the Holy
Spirit of promise, who is the guarantee of our inheritance until the
redemption of the purchased possession, to the praise of His glory."
Vs. 13-14
 
Concerning God's people, Scripture tells us--
They are a particular treasure:
"Now therefore, if you will indeed obey My voice and keep My covenant, then
you shall be a special treasure to Me above all people, for all the earth is
Mine." Exodus 19:20
 
They are chosen by Jehovah:
"For you are a holy people to the LORD your God; and the LORD has chosen
you to be a people for His own possession out of all the peoples who are on
the face of the earth." Deuteronomy 14:2
And,
"But you are a chosen generation, a royal priesthood, a holy nation, His own
special people, that you may proclaim the praises of Him who called you out
of darkness into His marvelous light. Who once were not a people but now are
the people of God." 1 Peter 2:9-10
 
They are guided like a flock:
"Know that the Lord, He is God;
It is He who has made us, and not we ourselves;
We are the sheep of His pasture." Psalm 100:3
Then Jesus speaking in John 10,
" I am the good Shepherd and I know My sheep and am known by My own." Vs. 14
"My sheep hear My voice, and I know them, and they follow Me." Vs. 27
 
Of chosen ones we see in James 2:5,
"Listen, my beloved brethren: Has God not chosen the poor of this world to
be rich in faith and heirs of the kingdom which He promised to those who
love Him?"
 
Who are the poor of this world? Those who are poor in spirit; those who know
that man cannot help himself, but need a redeemer. Jesus, in His Sermon on
the Mount tells us in Matthew 5:3,
"Blessed are the poor in spirit, for theirs is the kingdom of heaven."
 
We are safe in the shelter of God's love; saved for eternity by His grace
through faith, our salvation is the very gift of God!
 
With humble and grateful hearts, we say thank you Lord! Amen