Why is it certain that those ordained by God will enter the Kingdom?
It is certain because the Sovereign God has ordained them to enter, and God has spoken it. Everyone God has ordained to go into the Kingdom will find his place in it; not a single ordained Jew will miss it.
Les explains that the certainty rests in the fact that this is the Sovereign God at work. Since God has ordained people to go into the Kingdom, not a single Jew ordained to enter will miss it. Everyone ordained will find his place in it, because God has spoken it. The guarantee is God's own sovereign word, not human effort.