My favorite, inspirational- yet practical homeschooling book is Educating the WholeHearted Child by Clay and Sally Clarkson.
I have loved, loved this book. My favorite thing first and foremost about this book? -It is filled throughout with scripture, and much of it is found sprinkled throughout in the margins. I used this book as a devotional many times just by reading the margins every morning.
Educating the WholeHearted Child is unlike most homeschool books- it's very inspiring and yet, gives you practicle thoughts on setting up and running your homeschool- without making you feel like you must do it just like this. It's a great jumping off place, making you think deeply about why you are homeschooling, and about the importance of touching and keeping your children's hearts.
I do not, unfortunatley, have my copy to quote from, or to show you...I lent it out and never got it back. A new edition is due out this September, and I will make sure I get a copy!