Most powerful Tool

[Liberty]

After you've experimented with the idea of aggression and anger, try tranquility and cold calculation. You may find it even more useful.

Aggression and anger have their purposes, and they are infinitely more useful than fear and panic, but I think you'll find a common thread in most truly accomplished fighters is their ability to remain totally cool and collected under fire. It's a mentality that only comes with enough experience to build an honest and deserved confidence, but once it's there, it's one of the best, most useful mental tools I think anyone can have.

Basketball legend and OBLS Kareem Abdul Jabbar, in his autobiography, "Giant Steps," tells of an encounter he witnessed between Bruce Lee and a really skilled streetfigher friend of Kareem's. Jabbar relates how that, at first, the guy held his own, when all of a sudden this coldness came over Lee's face and demeanor. That next thing he knew Lee completely owned the guy from there on. Others have also related having observed and or experienced this chilling, unerving "cold and calculating aspect" of Lee's prowess.

[Garland]

I think a fighter reaches a true evolution when he can settle down and fight intellectually. Maybe not a lot of people get there, which is why so many still make mean faces and grunt and growl and try to look intimidating. But still, if you DO get there, you're a badass evermore.

So...look out for the ones with the thousand yard stare?