In lasers, light bounces between the mirrors, with each pass the light grows more intense. Our minds work similarly. Because of the "mirror" effect, where we can react to our reactions to our reactions to our reactions (and so on), changing our thought pattern even modestly at every level of reaction, can dramatically affect our ultimate experience.  Usually the greatest amplifiers are the ones we notice the least.  Learn what to notice -- to amplify more love rather than pain.