Centeredness is the cure for impulsiveness

Centeredness is the cure for impulsiveness.
Serenity is the master of restlessness.
Knowing this, one of universal nature is placid
     and never departs from the center of his own being.
Tao Teh Ching 26

It is generally the nature of weapons 
     to turn against their wielders.
[. . .]
to be excessively strong
     is to hasten decay [. . .] violence
     is against the integral nature of the universe.
Tao Teh Ching 30

Weapons are instruments of killing
     and destruction,
     which are contrary to the nature of life.
Thus, they are avoided by those who follow
     the subtle Way of the universe.
Tao Teh Ching 31

One of subtle universal virtue
     is not conscious of being virtuous,
     therefore, he is truly virtuous.
One of partial virtue attempts to live up to
     an external standard of virtue.
Therefore, he is not truly virtuous.
Tao Teh Ching 38

All translations from The Complete Works of Lao Tzu: Tao Teh Ching and Hua Hu Ching, An Enlightening New Translation and Elucidation by Hua Ching Ni.