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I don't think I can say it more clearly than the Holy See:
599 Jesus' violent death was not the result of chance in an unfortunate coincidence of circumstances, but is part of the mystery of God's plan, as St. Peter explains to the Jews of Jerusalem in his first sermon on Pentecost: "This Jesus (was) delivered up according to the definite plan and foreknowledge of God."393 This Biblical language does not mean that those who handed him over were merely passive players in a scenario written in advance by God.394
600 To God, all moments of time are present in their immediacy. When therefore he establishes his eternal plan of "predestination", he includes in it each person's free response to his grace: "In this city, in fact, both Herod and Pontius Pilate, with the Gentiles and the peoples of Israel, gathered together against your holy servant Jesus, whom you anointed, to do whatever your hand and your plan had predestined to take place."395 For the sake of accomplishing his plan of salvation, God permitted the acts that flowed from their blindness.396 "He died for our sins in accordance with the Scriptures"
The link which explains the issue more fully is in my previous post #324.
That's the part I wanted you to expound upon. Can you tell me what the above words mean?