What is the author's tone in A Severe Mercy by Sheldon Vanauken?

The tone of the book is also quite dynamic. Vanauken tells the whole story with obvious affection for the people who share the story with him, allowing the reader to become fond of them for the same reasons he so eloquently communicates. He opens the book nostalgic for a time and a lover that have since gone when he is visiting Glenmerle. The reader is allowed both to revel in his memories and mourn the passing of a joyful time. Then he rejoices in the memory of his and Davy's falling in love and in their lives together.