Von Balthasar's writings are like good wine. They require time. Don't try and plow through this little book trying to extract the key points. Rather, soak in it. Read and reread and reread the passages.
Almost like a liturgy, the rythmn of his thought gradually begins to weave around into the rythmn of your own thoughts. The goal of the book is simple and in the title: love alone is credible. Not thought, not subjective experience, not service, not great theology, but love fully expressed in the absolute kenosis (self-emptying/self-giving) love of the Son.
I hate to write too much about the content except to say that it is worthy for reading multiple times. As I was reading this book, I realized in a deeper sense why that it is better to read a few book over and over instead of reading many books on a superficial/intellectual level.
Love Alone is Credible is a good start to understanding the theology of Hans Urs von Balthasar. It stands as a summary of his intriguing and important theory of the conjunction between beauty and love. Love Alone is Credible is a short, yet dense, introduction to his von Balthasar's larger corpus of work.