““The laws of quantum mechanics don't permit the removal of arbitrary amounts of energy from a system consisting of two mutually attractive point particles. The laws of classical mechanics do predict that we can keep removing energy from a pair of point masses or point charges when bringing them closer and closer together, but this is a fallacy quantum mechanically. The laws of quantum mechanics see to it that the construction of a perpetuum mobile based on this process must fail, and not only for technical reasons.””