Chaim Potok, The Chosen

Reuven listen to me. The Talmud says that a person should do two things for himself. One is to acquire a teacher. Do you remember the other."
"Choose a friend," I said.
"Yes. You know what a friend is, Reuven? A Greek philosopher said that two people who are true friends are like two bodies with one soul."
I nodded.
"Reuven, if you can, make Danny Saunders your friend."
"I like him a lot, abba."
"No. Listen to me. I am not talking about only liking him. I am telling you to make him your friend and to let him make you his friend.

Life Quotes And Sayings by Chaim Potok, The Chosen