Rejection of Brute Force; This is saying, it is skill that is important, and not hard strength. Using hard strength is a poor way to use the energy of the body, and is not Tai Chi Chuan. Being soft and relaxed, and not indulging in a trial of strength is the best way to conserve energy. Always having something left. Tai Chi Chuan applications, just like the hand form, are smooth and continuous. Tai Chi is the training of relaxed power.
A word about training the above. When training to develop the ideas and techniques mentioned above, the key thing to keep in mind is, it is training, not competition. It is absorbing these concepts into your practice, and nothing to do with winning. There is a mutual aspect to training with a partner. Of course you train hard with them, but it is about how much you learn from training. If pushed, learn from it, if he is pushed, he learns from it. If you push, was it good Tai Chi or just force?
That is where the real winning is.
FIVE WINDS TAI CHI CHUAN EDINBURGH