"Never dwell on past events except in reference. To emphasize them would mean to take away from the importance of what's taking place now. A warrior cannot possibly afford to do that.
Only as a warrior can one withstand the path of knowledge. A warrior cannot complain about, or regret, anything. His life is an endless challenge, and challenges cannot possibly be good or bad. Challenges are simply challenges. As is always the case in the doings and not-doings of warriors, personal power is the only thing that matters. The basic difference between an ordinary man and a warrior is that a warrior takes everything as a challenge, while an ordinary man takes everything either as a blessing or as a curse."