It is usually the argument that the concept of predestination negates the need for evangelism. This was the error of so called hyper-Calvinists who took the doctrine and expounded on it. Their error was in seeing the decree of election as effective from before the foundation of the earth. This was not the doctrine as Westminster Assembly defined it. The Assembly instructed that salvation and regeneration still took place in time and therefore man is still truly a sinner prior to conversion. Further they taught that salvation although determined, was not absent of the means involved. It’s as if you were predestined to go on a vacation, God would see to it that the means to go on and get to that vacation were in place, not just the end. The means then insist that the proclamation of the gospel is necessary for evangelism/ making disciples of all nations. Far from being a concept of just Paul, or some OT passage that hints at the providence of God in all things, Jesus teaches that both predestination and evangelism are Godly principles that reside in and through Him and the Father.
25 At that time Jesus said, “I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. 26 Yes, Father, for this is what you were pleased to do.
27 “All things have been committed to me by my Father. No one knows the Son except the Father, and no one knows the Father except the Son and those to whom the Son chooses to reveal him.
28 “Come to me, all you who are weary and burdened, and I will give you rest. 29 Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. 30 For my yoke is easy and my burden is light.”
– Matthew 11:27-28
Within a few sentence Jesus teaches that predestination is a reality as the Son selectively reveals the Father to those who have been given to the Son. Practically within the same breath He breaks into an evangelical plea for the weary and burdened to come to Him. If then Christ weaves the two concepts together so masterfully in both teaching and action, we can and should hold to both as spiritual realities as well.