The chief virtue of this book, for me, was its genuinely sympathetic portrayal of its enemy - nihilism. Thielicke, in all his work, does a wonderful job of understanding the concerns of people in his age and future generations. Also, as opposed to certain other Christian authors, Thielicke is able to engage the human condition holistically and with all the rich tools of theology, philosophy, and culture, not just silly Scriptural one-liners.