Chuck Swindoll in his book, "Hope Again," tells the answer Dr. Bruce Waltke, his Hebrew professor, gave Chuck Swindoll when he asked his professor about some “whys” in his life. His professor answered: “Chuck, I’ve come to the place where I believe only on very rare occasions does God tell us why, so I’ve decided to stop asking.”
From a sermon by Ray Ellis, "Overflow of Love" 8/4/2008