Answer:
This is needed both for courage and hardcover books.
You can see nothing else, When you look in my face, I will look you in the eye, And I will never lie.
Three lives have I. Gentle enough to soothe the skin. Light enough to caress the sky. Hard enough to crack rocks.
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
What gets beaten, and whipped, but never cries?
What is always coming but never arrives?