Mankind has a problem with finality, especially the prospect of eternal death. Those who reject the Gospel are choosing the second death in the Lake of Fire.
One of the lessons of Ecclesiastes is that God is intimately involved in the lives and futures of those He has called into His purpose. To this end, He has given His people tremendous gifts that, if properly used, will build their faith and draw them close. . .
The sanctification process requires us to cooperate with God in order to produce Christian works and character, preparing us for the Kingdom of God.
God put up with the foibles of Abraham, Samson, David, Job, and others, allowing them time to repent and build character. We need to develop this godly trait.