The two worst strategic mistakes to make are acting prematurely and letting an opportunity slip; to avoid this, the warrior treats each situation as if it were unique and never resorts to formulae, recipes or other people's opinions. ↗
Music is emotional, and you may catch a musician in a very unemotional mood or you may not be in the same frame of mind as the musician. So a critic will often say a musician is slipping. ↗