When you are met with a problem that you can't solve, no matter how hard you try, it is no longer a problem. It has become reality. It is the thing that separates the weak from the strong, this reality. If you can learn to face this reality and accept that you can no longer solve it, you are a strong person. If you believe that a problem is not solved until it is gone, erased from your life, you need to work on your strength of reality.