Emotion

Many martial artists lose their temper in combat.
They fuel their responses with aggression and adrenaline.
This may prove effective, but it puts the body under duress.

Anger actually makes the mind stupid.
This is a medical fact.
It narrows the vision, limits coherent thought and causes the body to tense-up.

The internal arts favour emotional composure.
Anger is regarded as being an impediment, not a tool.