It is important to know the attributes of God. God is 100% perfectly Holy and 100% Just and He must punish sin. And the wages of sin are death; that is eternal death in a place of torment. But God is also 100% Merciful so He sent His only begotten Son as a human. Jesus is the ‘God-Man’. He was sent in human form so that He could take the punishment for the sins of the whole world. On the cross, Jesus Christ (God in human flesh) took upon Himself the punishment that we deserved even though He NEVER sinned. Not even once. This was a satisfactory punishment for our sins. Jesus took our place and our sins were nailed to that cross. When we believe this, we are at that very moment forgiven all our sins (past/present/future) and MADE RIGHTEOUS and are saved for all eternity and we can never lose our Salvation. He sealed us with the Holy Spirit indwelling within us as a new created being.
“In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.” (Ephesians 1:13-16 KJV)
At the moment of belief in the atonement Christ provided on the cross, we were changed positionally. Positionally we are now 100% righteous before God because all the sins we committed, or will commit after Salvation, were all penalty paid on the cross in Jesus. And now this is what God says about those who believe on the atonement of sins through what Christ did on the cross,
“For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.” (Hebrews 8:12 KJV)
That is the GOOD NEWS of the Gospel of Jesus Christ! We are saved 100% by the GRACE of God. Salvation is NOT based on our good works in ANY MANNER, neither before or after Salvation. Paul repeatedly wrote to not mix The Law (10 Commandments) with Grace. It is a false Gospel. There are many Scriptures from Paul that make this very clear.
The Holy Spirit Is Our Down Payment And Proof That We Are Heaven Bound!
The Holy Spirit is our proof of inheritance and shows that we were purchased by Christ and are Heaven bound from the very moment of our Salvation through belief in the atonement provided by Christ. Once sealed nothing can separate us from the love of God and our Salvation cannot be lost.
“And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.” (Ephesians 4:30 KJV)
“Now he that hath wrought us for the selfsame thing is God, who also hath given unto us the earnest of the Spirit.” (2 Corinthians 5:5 KJV)