For example, you may find that the best road to victory is to insult some foreign nation. If your mental purview is limited to the present, or if you have imbibed the doctrine that what is called efficiency is the only thing that matters, you will adopt such dubious means. Through them you will be victorious in your immediate purpose, while the more distant consequences may be disastrous.
Source: The Conquest of Happiness, 1930, chap. 15：Impersonal interests