“What does the Bible say about insecurity?”
The answer to that would very much depend on the type of insecurity in question.
For example, King Saul
was extremely insecure about his position as king of Israel, so much so that he
tried to kill the man he suspected would follow him on the throne. He had very good reason to be insecure, and there was no obvious cure to be found for his insecurity.
He had sinned, and was under the judgment of God. His
kingdom was to be taken away from him and given to another.
In short, he was trying to defend something to which he had no right. Living in that sort of untenable
position will always make us feel insecure.
