How do we know Christ's death was predetermined?

Christ's death was not a knee-jerk reaction to the events surrounding Him; rather, it was an event that had been appointed by God from eternity past. Jesus Himself said in John 10:18, 'No one takes my life from me, but I lay it down of my own accord.' This emphasizes that His sacrificial death was a part of God's eternal decree. The Old Testament provides numerous prophecies that foretold the manner of Christ's death, reinforcing that it was part of a predetermined plan orchestrated by God for the salvation of His people.