Is there such a thing as assurance of salvation or of your new birth about which Jesus spoke to Nicodemus?  How do we know that we have a new heart which is the New Covenant promise?  

In Hebrews we are told in chapter 11 that faith is the substance of things hoped for and the evidence of things not seen.  We can’t see salvation.  We do hope for it.  So to our hoped for but not seen salvation there is definitely evidence. 

When Jesus called each of the disciples, they had a decision to make.  Do I give my time my energy my life’s direction over to this Rabbi, who is promising that I will learn about God from Him.  They did not know that this One who was calling would be the only way to the Father and that He would be the provider of eternal life; not at least at that time did they know these things.  And yet they still obeyed the pull that they had writhing within their own inner man.  That area of self where emotion is often stirred leading  us to major life decisions, is the area most often used by God to communicate His own pursuit of man. 

Though they did not yet know that this was the Christ sent by God for our salvation; we do understand or we should now know this to be true.  He has told this to us in the gospels, and we have had it proven in His miraculous work among men. Works seen and recorded by these same chosen disciples in their words, and then verified by His own resurrection from the dead.  

God says that His Spirit searches for you, who have within your soul a contrite heart; one that longs for a relationship with God.  That longing is produced by the Holy Spirit, if you have ears to hear.  The Holy Spirit, whom Jesus had told His disciples would be a better presence to them while they were in this world; better than He Himself.  For one reason only this is true.  That reason: He the Holy Spirit is more able to be present with man, than is one individual known as the Son of man; because The Holy Spirit is omnipresent.  Jesus had given up all of that when He gave up His position with the Father.  But He, the Holy Spirit can speak to anyone person or to everybody at any given moment in time.  He speaks to our inner man, and He understands just who it is who has the ears to hear what Jesus is saying through Him.  So the Spirit stirs our hearts to want to know more about God.  And then it happens that this want to know about Him becomes a want to actually know Him. To actually know when He is stirring the waters of our heart, and then to want to respond to Him personally.  It is a personal relationship which allows one to know that we are His.  

If that is not your present situation then; He says:

Matthew 7:7  Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:  8  For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. (KJV)

So if it is assurance of one’s being a child of God with a resulting personal relationship that you want; then just ask.  God apparently loves to be sought after by persons of His Own creation.  We are not righteous in and of ourselves. We are made the righteousness of God by Him who has taken up residence in us.  Jesus when He tells us to abide in Him, also tells us that apart from Him we can do nothing.  He is our righteousness.  We truly have none of our own. He is not meaning that we can’t do our own thing when apart from Him, but that we can’t bear fruit worthy of God’s acceptance apart from Him.  In us He is directing our steps, and even giving us at times the words to say.  He told His disciples not to worry about what they were to say – not even when they were called before kings.  But that in that moment He would give them what to say (translating that promise also to us, we see this when we come to understand his prayers for us in John’s Gospel chapter 17).  His Spirit (the Holy Spirit) speaks His words to us as we are about the doing of His work. We in effect can do nothing in the way of fruit bearing for Him, without Him. 

If you don’t have the evidence of these things that can be hoped for in your life; then just ask.  Wanting to know this Heavenly Father who created us is the only want in life that truly will matter in the end.  We in effect are all terminal in this world.  

Eternal life is only offered to terminal mortals through Jesus, and through our belief and our acceptance of His death as payment for our sins, and by accepting His resurrection we have had made for us the deposit for our own future resurrection.  

We in effect throw ourselves on Him and on His mercy and grace, and this will see us through to His very side in the presence of our Father.  Experience God, Father, Son, and Holy Spirit and know the assurance of His offered life eternal. See you in His kingdom.