I don’t know that man can answer that question explicitly, but consider this food for thought. *if a baby in the womb could rationalize, he would say to himself, for example, why do I have feet? There are no sidewalks here! While the existence of feet in his current domain appears valueless, the next domain beckons their use and feet are of value.
Another example is one that is used as a Christian figure of God’s relationship to mankind (although it is evident to anyone): The father-child relationship. Fathers (or mothers) discipline their children. Sometimes it can come in the form of letting a child touch a sharp weed so that the child will learn the danger of the action. The father could lovingly inflict or permit suffering for a variety of reasons including that the child misbehaved or did something detrimental to himself that the father did not want the child to repeat. The discipline is applied to the child for a) reasons the child does not understand, and b) for reasons that result in the improvement of the child’s person. If we look at this example categorically, then we must admit not all infliction or permission of suffering equals evil or lack of love even if the recipient does not recognize value in the pain.
If a skeptic recognizes the love of a parent who permits his child to suffer for that child’s betterment, then he must acknowledge God could similarly do the same. God’s permission of suffering can rationally have an entirely loving motive behind it. (
read more here*)So although we don’t necessarily at this time “understand” some metaphysical explanation to suffering, we know Christ paved the way first.
In the final order, I think the answer must reside in the idea that this life, this temporal existence does not have the final say. We can only trust He who paved the way, and the Father who teaches the child unable to grasp.