First Impressions of God, the Emily Tappen Story by Ann Well and published by Grace and Truth Books.
"I don't believe mother knows that there is a God," said Emily Tappan as she ran in from the garden. "I'm sure she doesn't know or she would have told us all about it. Well, I'll just go and tell her." Blushing and almost breathless from the conscious importance of her communication she exclaimed, "Oh, Mother, there is a God. Mary Lewis told me so. And oh, he is so great! Greater than this house, greater than the tall trees, greater than everything, and I thought you would be glad to know it. I was so glad, and yet it made me afraid."