A dog, used to eating eggs, saw an oyster1 and, opening his mouthto its widest extent, swallowed it down with the utmost relish,supposing it to be an egg. Soon afterwards suffering great painin his stomach, he said, "I deserve all this torment2, for myfolly in thinking that everything round must be an egg." 
They who act without sufficient thought, will often fall into unsuspected danger. 