A brony that is in the stable has not yet told anyone outside of the internet about their love for My Little Pony, for fear of damaging relationships or alienating people.
John's favourite pony was Rarity, but he couldn't bring himself to put pictures of her on his wall because he was still in the stable.
Literally: "Treat others and expect to be treated in return."
A cycle, a revolution. An orbit of treating people. Once you treat another, it will be coming back to you.
"I treated my friend earlier this week, so this weekend I got an unexpected treat when i didn't even expect it. Classic case of Stabenism right there."