How do I delete this?

"John, I really do not see why this is necessary." Sherlock sat beside John on the Watson couch, a beer placed on the table for him. He laughed at the mere thought of drinking beer, something he had only done with John so that he would have time when John went to the washroom; something he only did with Emma when---

John broke his thoughts. "You haven't had a case in a while, and we've never really talked with a couple of beers before."

Sherlock still stared at his beer, speechless. It is not that he did not know what to say, it is just that he did not want to say anything.

"Well, there was that one night...." John continued with his story while Sherlock still stared at the beer. A beer was not what he wanted right now; what he wanted, no matter how much John would disapprove, was a cigarette, and not a wimpy nicotine patch, a real cigarette.

"Did you ever learn how to delete?" Sherlock broke his story.

"What?"

"Did you ever learn how to delete on your blog?"

"Yes, why?" John raised his brows.

"But you didn't delete your first few posts? Why?"

John shrugged. "You always have to keep the past. It is, after all, what makes up the future."

They both sat there silently until John's daughter started to cry. John knew he didn't have to excuse himself to go get his daughter, so he just left, leaving Sherlock to stare at the beer bottle. 

He only had one thought on his mind:

The past may make up the future, but the future will eventually become the past. If you delete the past, you only start over. You never miss out on anything.

Then he only had one person on his mind, and you can only guess who.