Wagner found this most eloquently illustrated in the Black spiritual, where the desire for freedom in this world and the hope for salvation in the next are inextricably intertwined.

瓦格纳在《黑人精神》一书中发现了这一点，在这本书中，对这个世界自由的渴望和对下一个世界的拯救的希望是密不可分地交织在一起的。