Not all fighting. Fighting to protect stuff is good. Fighting to make a beautiful fight that both sides can be proud of, in the spirit of SeiSeiDouDou is good. Fighting because you think you're better than other people or because you like hurting people is just pointless.

Thinking is fine. But thinking too much just means people make mistakes, and piles more mistakes on top of each other until their really big tower of thoughts is just one big mistake.