Mr. Trask, it's awful not to be loved. It's the worst thing in the world. Don't ask me - even if you could - how I know that. I just know it. It makes you mean, and violent, and cruel. And that's the way Cal has always felt, Mr. Trask. All his life! Maybe you didn't mean it that way - but it's true. You never gave him your love. You never asked for his. You never asked him for one thing. But you must give him some sign, Mr. Trask, some sign that you love him... or he'll never be a man. All his life he'll feel guilty and alone unless you release him.
Mr. Trask, it's awful not to be loved. It's the worst thing in the world. Don't ask me - even if you could - how I know that. I just know it. It makes you mean, and violent, and cruel. And that's the way Cal has always felt, Mr. Trask. All his life! Maybe you didn't mean it that way - but it's true. You never gave him your love. You never asked for his. You never asked him for one thing. But you must give him some sign, Mr. Trask, some sign that you love him... or he'll never be a man. All his life he'll feel guilty and alone unless you release him.
http://www.moviequotedb.com/movies/east-of-eden/quote_63048.html