Then at once they reached and hovered upon the imminent verge of sleep - but an intruder came, now, that would not "down". It was conscience. They began to feel a vague fear that they had been doing wrong to run away; and next they thought of the stolen meat, and then the real torture came [...] So they inwardly resolved that so long as they remained in the business, their piracies should not again be sullied with the crime of stealing. Then conscience granted a truce, and these curiously inconsistent pirates fell peacefully to sleep.

Mark Twain