See also: Napoleon's "four types of soldiers":

  Clever & Lazy: Ideal leaders for high command, mentally sharp but avoid unnecessary action, making sound, difficult decisions
  Clever & Hardworking: Excellent for the General Staff, diligent and smart, ensuring details are covered
  Stupid & Lazy: Harmless for routine duties, don't cause trouble
  Stupid & Hardworking: Dangerous, must be removed as they create unnecessary work and cause damage