Killing is a word that refers to an act which results in death, and this may be a crime or it may be justified. Killing quotes show that this action is not always a bad thing. A mercy killing occurs when someone or something is suffering and they have no hope of survival, but nature would take a long time for death to occur naturally. When hunters bag a deer they are engaged in killing the animal whether they use a gun, a bow and arrow, or another lethal weapon. A justifiable killing occurs in cases where an individual was killed in self defense or after a trial and a death sentence has been handed down. The act of killing someone is a mortal sin as well as a crime, unless it was justified by the situation or circumstances.