Problems happen because of a flawed use of your power to create your life. In other words, your problems form because of your lack of a clear vision of what you want. Their existence makes it possible for you to see exactly what your flawed thinking is. Problems are not threats. They are the means by which you learn how to handle your inner and, thus, your outer worlds.
The metaphysical meaning of the battle between David and Goliath was to demonstrate that every overwhelming problem has a weakness. David was able to kill Goliath - not because he was bigger or stronger but because he was the only one who looked for Goliath's weakness rather than seeing him as a bigger than life threat.
In the story, David found Goliath's weakness to be his forehead. In metaphysics the forehead. or the third eye as it is sometimes called, is the seat of the imagination. Your problems start with the acceptance of a bad idea, and then your imagination clothes that idea with the necessary form to bring it into existence. Problems take many forms: lack of money, cancer, or social difficulties for example.
If you see a problem as being bigger than life and see yourself as a helpless and hopeless victim of it, take the time to follow David's example. Look for its weakness and focus your energy on targeting that point until you have overcome it.