"It is finished"
It seems every year on Good Friday the whole "Satan and all thought they won but Sunday is coming" language is brought out afresh. John 19:30 is a clear repudiation against such language. The victory of salvation found its culmination on Christ's declaration of "It is finished". The Greek word translated "It is finished" is "tetelestai". The word conveys bringing to an end something. To complete something. Jesus is declaring all required for our salvation is complete. He has brought an end to the reign of sin. He has paid the debt His people owed. Removed the guilt. Covered the sin. Earned the righteousness required. All that is required for our salvation was accomplished on Good Friday. Sin, Satan, and Death were defeated by Christ on the cross on Good Friday.
Now, indeed our faith is foolish if Christ has not risen from the dead (1 Corinthians 15:17). Why? Because the resurrection is the validation of the person and work of the Lord Jesus (Romans 4:25). It is not the victory but rather the declaration of the victory. The victory is the cross of the Lord Jesus. It is the "It is finished". It is like the receipt received at a store. The receipt is not the exchange of goods for funds. That happens when payment is made. The receipt shows such an exchange has occurred. The resurrection is the receipt that the Great Exchange took place in the cross of Christ. Our sin taken by Him and His active and passive righteousness imputed to us who believe.
21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God. (2 Corinthians 5:21)
This Good Friday may we look to Christ Jesus with awe and wonder. The Lord Jesus Christ died for sinners and accomplished our salvation. Christ declared "It is finished"!