Scripture teaches predestination. For two examples, consider Ephesians 1 and Romans 9. In these chapters, Paul says that before the foundation of the world, God chose a certain number of people to salvation in Christ. He did this not based on man’s merits or choice, but his own mercy and sovereign will. Election is therefore unconditional; it’s not conditional upon a person’s choice, will, or works. In the early 5th century Augustine echoed Scripture’s teaching on this point as did others later in church history. The Reformers also taught this truth in the 16th century and the doctrine of unconditional election is found in the Reformed Confessions.
In fact, the Reformed Confessions say that this truth of election must be taught and preached: Here’s article 14 of the 1st point of doctrine in the Canons of Dort:
“As the doctrine of divine election by the most wise counsel of God was declared by the prophets, by Christ himself, and by the apostles, and is clearly revealed in the Scriptures both of the Old and the New Testament, so it is still to be published in due time and place in the Church of God, for which it was peculiarly designed….”
Augustine said the same thing around 1,200 years before the Canons of Dort were written:
Wherefore, if both the apostles and the teachers of the Church who succeeded them and imitated them did both these things—that is, both truly preached the grace of God which is not given according to our merits, and inculcated by wholesome precepts a pious obedience—what is it which these people of our time think themselves rightly bound by the invincible force of truth to say, “Even if what is said of the predestination of God’s benefits be true, yet it must not be preached to the people”?
It must absolutely be preached, so that he who has ears to hear, may hear. And who has them if he has not received them from Him who says, “I will give them a heart to know me, and ears to hear”? Assuredly, he who has not received may reject; while, yet, he who receives may take and drink, may drink and live. For as piety must be preached, that, by him who has ears to hear, God may be rightly worshipped; modesty must be preached, that, by him who has ears to hear, no illicit act may be perpetrated by his fleshly nature; charity must be preached, that, by him who has ears to hear, God and his neighbours may be loved—so also must be preached such a predestination of God’s benefits that he who has ears to hear may glory, not in himself, but in the Lord.
Augustine of Hippo, “A Treatise on the Gift of Perseverance,” in Saint Augustin: Anti-Pelagian Writings, ed. Philip Schaff, trans. Robert Ernest Wallis, vol. 5, A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, First Series (New York: Christian Literature Company, 1887), 546–547.