Everyone is a potential murderer-in everyone there arises from time to time the wish to kill-though not the will to kill.

Any man may easily do harm, but not every man can do good to another.

thus it is that every man, in the state of nature, has a power to kill a murderer, both to deter others from doing the like injury, which no reparation can compensate,

You can kill me, but you can't make me obey.

Everyone is entitled to commit murder in the imagination once in a while, not to mention lesser infractions.

I cannot kill. Unfortunately, there are so many who can and do kill. As I cannot kill I cannot authorize others to kill. Do you see? If you are buying from a butcher you are authorizing him to kill — kill helpless, dumb creatures, which neither I nor you could kill ourselves. So that I am for that reason a vegetarian, as most Russians are. For nine years I have been a vegetarian, and I shall be one — mind, I am a man with strong convictions — to the end of my life.

If you establish and apply the principle that you can kill 'unproductive' fellow human beings then woe betide us all when we become old and frail! If one is allowed to kill the unproductive people then woe betide the invalids who have used up, sacrificed and lost their health and strength in the productive process. If one is allowed forcibly to remove one's unproductive fellow human beings then woe betide loyal soldiers who return to the homeland seriously disabled, as cripples, as invalids. If it is once accepted that people have the right to kill 'unproductive' fellow humans--and even if initially it only affects the poor defenseless mentally ill--then as a matter of principle murder is permitted for all unproductive people, in other words for the incurably sick, the people who have become invalids through labor and war, for us all when we become old, frail and therefore unproductive.

We kill at every step, not only in wars, riots and executions.
We kill when we close our eyes to poverty, suffering and shame.In the same way all disrespect for life, all hard-heartedness,all indifference, all contempt is nothing else than killing.

Any one can get angry — that is easy — or give or spend money; but to do this to the right person, to the right extent, at the right time, with the right motive, and in the right way, that is not for every one, nor is it easy.

Kill, if you must, because in our weakness and in our error, we have found no other road to peace, but kill remorsefully, kill with a sense of sorrow, kill with economy for the immortal souls who leave this life in battle, carry mercy in your cartridge cases, forgiveness in your knapsacks, kill without revenge, because vengeance is not yours but the Lord’s, kill, knowing that each life you spend makes your life that much the poorer.

They may kill me, but they cannot hurt me. — Socrates

Anyone can get angry, but to do this to the right person, to the right extent, at the right time, with the right motive, and in the right way, that is not for everyone, nor is it easy.

يمكن أن يعتاد المرء على أي شيء، بما في ذلك القتل.

[Dickens] was the character whom anybody can hurt and nobody can kill.