Broken people often speak negatively because they have just about given up hope. They tend to forget what the Word says about how a man will be satisfied with the fruit of his mouth (Proverbs 12:14).
This is what the children of Israel did. They spoke negatively saying their wives and children would be taken, and they would die in the wilderness. God responded to them by giving them over to the evil that they had spoken upon themselves, but he said he would spare Caleb and the children of those who did not believe.
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