A very young fox, who had never before seen a lion, happened to meet one in the forest. A single look was enough to send the fox off at top speed for the nearest hiding place. The second time the fox saw the lion he stopped behind a tree to look at him a moment before slinking away. But the third time, the fox went boldly up to the lion and, without turning a hair, said, "Hello, there, old top." 
Familiarity breeds contempt. Acquaintance with evil blinds us to its dangers. 