The art of the police is not to see what it is useless that it should see.

In a battle, as in a siege, the art consists in concentrating very heavy fire on a particular point. The line of battle once established, the one who has the ability to concentrate an unlooked for mass of artillery suddenly and unexpectedly on one of these points is sure to carry the day.

The art of choosing men is not nearly so difficult as the art of enabling those chosen to attain their full worth.