From an early age Belloc knew Cardinal Henry Edward Manning, who was responsible for the conversion of his mother to Roman Catholicism. In "The Cruise of the "Nona"" (1925), he mentions a "profound thing" that Manning said to him when he was just twenty years old: ""All human conflict is ultimately theological."" What Manning meant, Belloc explains, is "that all wars and revolutions, and all decisive struggles between parties of men arise from a difference in moral and transcendental doctrine." Belloc adds that he never met any man, "arguing for what should be among men, but took for granted as he argued that the doctrine he consciously or unconsciously accepted was or should be a similar foundation for all mankind. Hence battle." Manning's involvement in the 1889 London Dock Strike made a major impression on Belloc and his view of politics, according to biographer Robert Speaight. He became a trenchant critic both of capitalism and of many aspects of socialism.