“It is done” Because Jesus said “It is finished.”
Philippians 3:10, That I may know Him and the power of His resurrection…
John 19:28, After this, Jesus, knowing that all things were now accomplished, that the Scripture might be fulfilled, said, “I thirst!” 29 Now a vessel full of sour wine was sitting there; and they filled a sponge with sour wine, put it on hyssop, and put it to His mouth. 30 So when Jesus had received the sour wine, He said, “It is finished!” And bowing His head, He gave up His spirit.
We can say “It is done” Because Jesus said “It is finished.”
#1 - Jesus finished the endless cycle of Jewish sacrifices and created the path to redemption
#2 - Jesus finished access to God the Father.
#3 - Jesus finished the endless cycle of guilt and self-condemnation.