Japanese samurai culture considered smiling and talking as a sign of weakness in combat. This is because smiling and talking only lead to excuses - decisions change circumstances, talking rarely does so.
The premise is that during times of trial, one should let actions speak for you.
Oftentimes in todays world it is easy to get wrapped into conversation, when action is almost always more valuable. The best conversations even lead to actions.
Samurai knew this and acted first, and corrected errors later with words and more actions. They recognized that acting, without devoting even tertiary conversation, was often the correct choice - and that that choice would be reached with, or without conversation.
Those that spoke begged for their lives, those that didn't speak were the deciders.