Cool Awesome Saying 'A black belt is a white belt who refused to quit' Taekwondo and Karate t-shirt is an inspirational and motivational quote tee for taekwondo expert, karate instructor, martial art students, a fighter who never give up.. Makes a great christmas, birthday grading or any other present giving occasion gift for instructors, sensei, black belts or beginners, anyone who like martial arts including karate, judo, jiu jitsu and taekwondo.