The act of taking one's own life voluntary and intentionally; self-murder; specifically (Law), the felonious killing of one's self; the deliberate and intentional destruction of one's own life by a person of years of discretion and of sound mind.
Suicide is man's way of telling God, 'You can't fire me - I quit.' Bill Maher
So smoking is the perfect way to commit suicide without actually dying. I smoke because it's bad, it's really simple. Damien Hirst
Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There never was a democracy yet that did not commit suicide. John Adams
Suicide is a permanent solution to a temporary problem. Phil Donahue
They tell us that suicide is the greatest piece of cowardice... that suicide is wrong; when it is quite obvious that there is nothing in the world to which every man has a more unassailable title than to his own life and person. Arthur Schopenhauer