“ Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read. ”
Source: The Essential Groucho: Writings For By And About Groucho Marx
Similar Quotes
If you have enough book space, I don't want to talk to you. 
If a book is well written, I always find it too short. 
I went to a bookstore and asked the saleswoman, 'Where's the self-help section?' She said if she told me, it would defeat the purpose. 
One must always be careful of books... and what is inside them, for words have the power to change us. 
I went away in my head, into a book. That was where I went whenever real life was too hard or too inflexible. 