The Israelites would not cross over into the promised land because of the giants. They did not know God would fight for them and defeat the giants. All but two men perished in the wilderness for what they did not know (Numbers 13:27-33).

     Hearing that a nation has a nuclear bomb does not give one the understanding of how to build it, arm it, or defuse it.

     Knowing God exists does not mean that one knows God is God. The devils know God exists, but they do not know (understand) that He is God. "Thou believest that there is one God; thou doest well: the devils also believe, and tremble (James 2:19). What the devils do not know hurts them.

     A difference becomes apparent between having knowledge versus having understanding. When one has understanding, the person's life reflects the understanding. Therefore, the knowing or understanding helps the person.

     "And unto man he said, Behold, the fear of the Lord, that is wisdom; and to depart from evil is understanding (Job 28:28). Yes, what you do not know will hurt you.