I've read so many books that touched me deeply but I'd have to say that certain books I read as a child evoked the most profound emotions.
One such book, that I read when I was about 9 or 10 was
Mister God, This is Anna by Sydney Hopkins (written under the pseudonym Fynn). I felt like a door into a strange and wonderful new land had appeared before me. A few years ago I found a copy of the book in a used-book store but I still haven't plucked up the courage to re-read it. I'm afraid I'll be disappointed, reading it again as an adult.
S.E. Hinton's YA books stunned me, especially because she had her first book published at the age of 17. I was about 14 when I discovered her books and it was the first time I read fictional books about teenagers who struggled with issues like gangsterism, abuse, drugs, alienation and so on. At that age I was grappling with some of the same issues and it was a revelation to read books by a writer who seemed to
know what I was going through.
One book I read as an adult that contained passages that touched me deeply is
Horse Heaven by Jane Smiley. The book is set in the world of horse racing and is written from the perspectives of several characters, including two horses. One of the horses, Justa Bob, is one of the most amazing fictional characters (human or animal) I've ever encountered. I fell in love with this horse and...I'm not exaggerating...I felt a physical yearning to be able to put my arms around him and just be in his presence. It embarrasses me a bit to admit that but that was how I actually felt.