Does God draw a line in the sand when it comes to sin? That is, can unbelievers rebel against God so grievously, and reject His grace so persistently, that ultimately they pass a point beyond which they can never be saved?
It appears the answer is yes. Consider the following passages of Scripture.
Gen. 15:16 – “for the iniquity of the Amorites has not yet reached its full measure.” The Lord tells Abraham that his descendants are to be enslaved and oppressed for 400 years (in Egypt), after which God delivers them from bondage and brings them into the Promised Land.
Why the delay in fulfilling His promise to Abraham? Because the Amorites’ measure of sin is not yet full. The Amorites are engaged in degrading sin. God has determined to destroy them and to give their land to His chosen people.
In a similar manner, Noah proclaims judgment upon the wicked for 120 years, but God determines the day in which He closes the door of the ark and opens the floodgates of heaven.