"As long as Europe is not strong enough to follow up the results already obtained by her voyages of discovery, the explorer can never be satisfied with his work; it will have injured rather than benefited the native races. People hesitate before resorting to extreme measures, but they lose sight of the fact that, if their efforts were concentrated on a single object, more would be done in a day for the real welfare of Africa than has been accomplished in past decades, nay even in past-centuries."
January 1, 1970
https://en.wikiquote.org/wiki/Arab_slave_trade