Taekwondo can be characterized by unity: the unity of body, mind, and life, and the unity of the pose ["poomsae"] and confrontation, and cracking down. When you do Taekwondo, you should make your mind peaceful and synchronize your mind with your movements, and extend this harmony to your life and society. This is how in Taekwondo the principle of physical movements, the principle of mind training, and the principle of life become one and the same. On the other hand, the right poomsae lead to the right confrontation, which will eventually produce great destructive power.
How come we reach such a unity in Taekwondo? Taekwondo is a way of life, much like having a job, raising a family, fighting for a cause, or any one of numerous raison d'etre. What makes Taekwondo different from these is that it is an activity for survival in extremely antagonistic situations. One must always overcome the enemy that is trying to cause harm. But simply winning a fight is not enough to guarantee one's safety, because the enemy may recuperate and attack again. Moreover, there may be many other enemies than the one that was just defeated. One cannot ever feel safe unless one gains permanent peace. To attain this permanent or lasting peace, one needs unity. This is what Taekwondo aim for. Otherwise Taekwondo would be no different from any other street-fighting skills.