If one of us only was good, we could never be true friends.

I must be good as well as you, else we shall never understand each other!" "How kind you are, Mr.Grant! You treat me just like another one!" said Davie.
"But we must not forget that I am the big one and you the little one, and that we can't be the other one to each other except the little one does what the big one tells him! That's the way to fit into each other." "Oh, of course!" answered Davie, as if there could not be two minds about that..