in what is thought... there should be just the thought..

In what is seen, there should be just the seen; 
In what is heard, there should be just the heard; 
In what is sensed, there should be just the sensed; 
In what is thought, there should be just the thought. 
He should not kill a living being, nor cause it to be killed, nor should he incite another to kill.
Do not injure any being, either strong or weak in the world.
Sutta Nipata II,14