“I tried to spare you, John, but you refused to be spared. I knew you and Mycroft were destined for a confrontation, and you would be the loser. I tried to stop you. I put three days in on it, trying to focus your fickle attentions on your duty and me. I tried to break you gently, slowly, painlessly. But even if Mycroft hadn’t put an end to it, it was futile. I see that now. You are too stubborn. You won’t go softly, you are going to hold on to your sense of independence to the bitter end.” Sherlock stood wiping his fingers once more. He tossed the cloth down, angrily. “You are going to shatter and I have no idea what will become of you after that.”from Collared by VelvetMace
THANK YOU! god, it was driving me crazy trying to remember!