I would add that this can be extremely challenging (and possibly triggering) for people who had traumatic childhoods. In those cases it is best to start with loving compassion towards a beloved pet, for example — something simpler, that is not so emotionally charged.

Either way the metta instruction I’ve encountered has often failed because it failed to emphasize the sensation of emotion. It’s not lying there thinking about how much you love something. It’s thinking of the thing or person you love and trying to locate the specific sensation in your body, and then grow it.

Many people mistake ritual dissociation for meditation, which can be really really harmful.