The Tenets (Jung shin) of Taekwon-Do are:
To be polite at all times. Within the Dojang this would include being polite to one’s Instructor, seniors and fellow students but remember that courtesy (as well as the other tenets) should also be used outside of the dojang.
To be honest to one’s self and others. A student must be able to define right and wrong.
To achieve a goal, whether it is a higher grade or any technique, one must not stop trying; one must persevere.
To lose one’s temper when performing techniques against an opponent can be very dangerous and shows a lack of control. To be able to live, work and train within one’s capability shows good self-control.
To show courage when you and your principles are pitted against overwhelming odds.