Why Bad thing Happen to Good People

If God loves all of his children why isn't everyone freed from their burdens? Why is one child  cured from his disease while the child in the next bed is not? Did one child's parents pray harder than the others? Was one child's parent's faith not as strong as that of another? Why do children have to die at all? These, and many others along the same line, are questions that plague us all, both Christian and non-Christian.