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You can easily pick off a thorn (刺) in your body. But if the thorn is in your heart, how will you pick it off? The thorn can be your mistake or secret.
Doctor Ralston once told me a true story. One day, a man came to Doctor Ralston with different kinds of trouble: He had a headache, and he couldn' t fall asleep at night. Doctor Ralston gave the man some careful exams. However, he found nothing wrong with the man.
He said, "If you don' t tell me what' s worrying you, I can' t help you. "
The man said that he once cheated (欺骗) his friend. Then Doctor Ralston let the man write to his friend and say sorry to him. When the man put the letter into the post box, he suddenly cried, "Thank you. I think I get well. "
The man spoke out his mistake and he corrected it. He picked off the thorn in his heart. He cured (治愈) himself.