Metta meditation and it's integrated to Vipassana trainings. I've already had that training twice during the previous trainings. However in my third sitting in Thailand, I noticed that I have a strong blockage to say “may all beings be happy”.
I wish that was the only discovery I had on the subject. Coming back, I had a lot of catching up to do with friends and this of course involved a bit of gossiping too. I came to know that one of those people whom I couldn't wish well was actually going through a very miserable period in his life. Ohhh, that was the moment in which the bitch in me felt so relieved. That relief was immediately followed by a deep feeling of sympathy. Only after coming to know that he was not happy, I could feel for him, wishing him to be truly happy and be relieved from his pain. What the hell did that mean? Was I trying to put an unconscious cap on the happiness of other people? May all beings be happy as long as they are not happier than me? Or may all beings be happy only after I wish them to be happy? Or people who hurt me are allowed to be happy only after suffering for a certain period of time? I still don't even have a clue, none of these create a buzz in my gut, so there's a possibility that it comes form a more deep-rooted or evil place than I could see. I don't like this, I now find it very hard to say “hey, this is who I am so let's celebrate the evil in me and hug her every morning to make up for the time lost that I wasn't aware of her existence”. Blah