"Knowing all things were accomplished...
He said, it is finished."
John 19:28-30
28 After this, Jesus knowing that all things were now accomplished, that the scripture might be fulfilled, saith, I thirst.
29 Now there was set a vessel full of vinegar: and they filled a spunge with vinegar, and put it upon hyssop, and put it to his mouth.
30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
John 17:4
I have glorified thee on the earth: I have finished the work which thou gavest me to do.
What a faithful and glorious Saviour! He wouldn't give up His ghost until ALL THINGS were accomplished; until the whole work of redemption was finished!
That's the heart of the gospel, the good news of the FINISHED work of redemption by Christ Jesus for His people.
The Father purposed that redemption for His chosen people.
The Son executed, and accomplished that redemption for the same.
The Holy Spirit applies that redemption to each of the same at God's own appointed and approved time.
The recipients of such redemption are called to believe, and live in light of, the truth of that salvation.
That's the function of the gospel ministry.