My tai-chi teacher is all about martial principal. Any thoughts on this?

I have been with him for about 3 years. His students tend to be better than most, regardless of what art people practice, in self-defense, or offense, is they so choose. Is this too much too fast, for tai-chi? He fought competitively for years (with external arts), but says he never understood power until he began practicing the internal arts. This man has multiple black belts in many different external arts. Just curious what you have to say.|||I agree with him. Taichi is all about the internal chi and the very core of one's strength.|||Tai Chi does not always need to be practiced slowly. Though always practicing quickly is a mistake IMO.