W. E. B. Du Bois expressed the difference between racialism and racism when he argued that races are real entities. In 1897, he wrote: "At all times, however, [people] have divided human beings into races, which, while they perhaps transcend scientific definition, nevertheless, are clearly defined to the eye of the Historian and Sociologist."[2] Du Bois was a racialist who believed that racial identities were "valuable properties of human individuals, and that racial solidarity can help realize such human goods as equality and self-actualization."[3] He further stated that racism required advancing the argument that one race is superior to other races of human beings.