The charge that an idea is radical, impractical, or long- haired is met by showing that a prominent businessman has favored it†an additional tactic in this strategy of defense†is to assert that Winston Churchill once sponsored the particular idea. If one is challenged, a sufficiently careful investigation will show that he did.

-Galbraith,John Kenneth
  Economics and the Art of Controversy.

No, painting is not done to decorate apartments. It is an instrument of war for attack and defense against the enemy.

-Picasso, Pablo Ruiz y
  Responding to claims that his Communism was a mere caprice. Quoted in Alfred H BarrJr Picasso: FiftyYears of His Art (1946).