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First thing we need to establish is what the Divine Plan is. Predestination is certainly part of it but it also has to do with redemption and salvation. “In him [Christ Jesus] we have redemption through his blood, the forgiveness of sins” (Ephesians 1:7). Here is a brief Reformed Protestant view:
Salvation is entirely the work of God and since the plan of salvation was conceived before Adam and Eve were created, then it is entirely proper to conclude that there is divine order at work. The Bible demonstrates God’s sovereignty and shows that nothing happens that God does not ordain, cause, or allow. The Creator God is not a God of disorder (1 Corinthians 14:33) but is a God of order.
First, within the Godhead, the divine plan of salvation is agreed. Second, the divine plan is executed when Christ Jesus willingly gave up his life in order to atone for the sins of the world. Third, the divine plan is to this day seeing fulfilment in the lives of believers who have come to saving faith through the good office of the Holy Spirit. Nothing was left to chance. Everything necessary was planned in advance and all three parties were in agreement. And because God is Sovereign and Omnipotent, and because Christ Jesus was resurrected from the dead (as part of that divine plan), then the outcome is assured.
That’s the good news. That’s the reassuring part of the divine plan. The bad news (the stark reality) is that those who reject the means by which salvation can be granted are also part of the divine plan. They are deemed to be eternally lost – which is the opposite of being eternally saved.
The article in the link below has this to say about Calvin’s third book - The Mode of Obtaining the Grace of Christ. The Benefits It Confers and the Effects Resulting from It:
God’s predestination is sovereign and independent of foreknowledge, and His election is eternal. Men’s claim that predestination is unfair merely exposes their inability to understand God. All those who are predestined will be called by God and will have faith. The final resurrection will be physical for both the elect and the reprobate. Hell is real and eternal. Source: https://www.gotquestions.org/John-Calvin.html
It’s not so much Calvin’s “message of stark but reassuring order in the divine plan” as it is God’s message to humanity regarding the stark consequences of rejecting the divine plan of salvation. That the divine plan of salvation is ordered by God is plain to see from what the Bible tells us about the life, death and resurrection of Christ Jesus, who gave up the glory he shared in heaven in order to dwell with us and to do the will of the Father who had sent him.