what is your favorite adrienne von speyr book?

As a growing number of works by Adrienne von Speyr are being translated, a richer picture of her thought is being painted in the English-speaking world.  No matter how many books of Adrienne von Speyr you have read, what book of hers is your favorite?

Please post it in the comments section below.

For those of you wondering about me, my favorite is Handmaid of the Lord.  You can see my other favorite von Speyr books here.

What is your favorite Adrienne von Speyr book?