Joh 19:30 So when Jesus had received the sour wine, He said, “It is finished!” And bowing His head, He gave up His spirit.
This is the last word of Jesus on the cross, marking the end of Old Covenant of Law, and beginning the New Covenant of Grace, as He declared it during the last supper on the night before crucifixion in (Luk_22:20 Likewise He also took the cup after supper, saying, “This cup is the new covenant in My blood, which is shed for you.)
Thus the right walks of a Christian should rightfully start from here, when Jesus said “it is Finished”, what did He mean? We, preachers and teachers of Bible, must be contextual, based on the context of the bible and in the right chronological order set by Holy Spirit in the Bible.
The first words of Jesus recorded in the bible were in (Luk_2:49 And He said to them, “Why did you seek Me? Did you not know that I must be about My Father’s business?”) where Jesus was only 12 years old, and the parents found Him inside the temple. Jesus said, He came to do about His Father’s business. What is that business?
Jesus’ main resume is a Savior for He will save His people from their sins; this was stated by the angel of the Lord before he was born to this world (Mat 1:20-21 …, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not be afraid to take to you Mary your wife, for that which is conceived in her is of the Holy Spirit. And she will bring forth a Son, and you shall call His name JESUS, for He will save His people from their sins.”)
Has Jesus done successfully so on the cross?, when He shouted “it is Finished” ? Certainly, He has completed His task perfectly. By our doubting whether we still have unforgiven sins in our life, indirectly undermines and insults the perfect work of Jesus on the cross. Jesus is God, God never fails, God never lies, and Jesus is also the perfect Lamb of God (Joh_1:29), and He is beyond time and space. When He remitted our sins, it covered past, present and future sins, even to the sins that we have not committed yet, Yes, ALL those sins have also been pardoned, forgiven, redeemed and remitted. He paid it all !
Do not see from human perspective, but look through the eyes of God, of How God see. When Jesus died on the cross, anyone of us in this generation, have been born yet ? certainly no one was born yet, therefore the cross transcends time and space and into the past, present and future, ALL our sins are future sins when Jesus died on the cross for our sins.
What is finished again? The night before Jesus said “it is finished” and died on the cross, in (Mat 26:39 He went a little farther and fell on His face, and prayed, saying, “O My Father, if it is possible, let this cup pass from Me; nevertheless, not as I will, but as You will.”) What cup is Jesus talking about? it is the cup containing your sins and my sins that He had to bear and become sins for us. The punishments of our sins were upon Him. And, none of those punishments escaped from Jesus, He bore them ALL. So, when He said “it is finished”, Jesus really meant no more punishments of sins shall we bear any more, all done and paid for by Him on the cross.
This is where our Christian life should start, the awareness of a fully Christ-redeemed life, completely RIGHTEOUS, completely HOLY, there is no longer any spots of sins in our life. Although, our conduct in day to day’s life may not be perfect yet (no one will be perfect, not even one!), but we should start off our Christian life with this understanding and belief that we are Righteous in Christ, and then we can walk our Christian journey with peace & joy in the Holy Spirit. This is what it means when Jesus said in (Joh 8:32 And you shall know the truth, and the truth shall make you free.” )
We are solidly based on the Righteous foundation of God (2Co 5:21 For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.)
God himself who sacrificed His own son to wipe out the requirements of the Law, i.e: The Law required the punishment of sins is death, and everyone has failed & will continue to fail the requirement of the Law. (Col 2:14 having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross.)
Your walk in life may not be perfect, but with the perfect peace and conscience in your heart & mind, you will walk with Christ-confidence and make lesser and lesser mistakes in life. Your default is no longer sin, but righteousness. You will not be aware of self, but being aware of Christ, His loveliness and the perfection of His work on the cross. That is where sins will have no more power in your life. (Rom 6:14 For sin shall not have dominion over you, for you are not under law but under Grace.)
Also read: https://liftingjesus.org/2014/04/28/the-passion-of-the-christ-unseen-the-spiritual-agonies/