Immanuel Kant, in his Fundamental Principles of the Metaphysics of Morals, wrote: "Nothing can possibly be conceived in the world, or even out of it, which can be called good, without qualification, except a good will."
康德在《道德形上學的基本原理》開宗明義即說：「在世界之內，甚至根本在它之外，除了一個善的意志之外，我們不可能設想任何事物，它能無限制地被視為善的。」