All Shadows Pass Away (гет)

This was written for the SS/HG exchange in 2012. It was a gift for delphipsmith and could well be considered as a sequel to her story "A Price Beyond Rubies"
The prompt was as follows:
After the war and his recovery Severus has totally rejected magic and, surprisingly, retreated to a Muggle monastery in a remote area. Why did he reject magic? Why did he turn to a Muggle monastery, of all things? Hermione is determined to bring him back to the world -- why? Does she persuade him not to forsake his magical heritage? I don't require a happy ending, just a logical one. Also, I will not be offended by any treatment of Christianity whether pro, con or neutral, so long as the story supports it.