An occasion such as this which has brought us here can not but direct our consideration to these things. It has been a painful and difficult experience, this by which another race has been recruited to the standard of civilization and enlightenment; for that is really what has been going on; and the episodes of Negro slavery in America, of civil war, and emancipation, and, following that, the rapid advancement of the American colored people both materially and spiritually, must be recognized as parts of a long evolution by which all mankind is gradually being led to higher levels, expanding its understanding of its mission here, approaching nearer and nearer to the realization of its full and perfected destiny.

The Progress of a People (1924)