"The only defensible war is a war of defense."
"My Botswana books are positive, and I've never really sought to deny that. They are positive. They present a very positive picture of the country. And I think that that is perfectly defensible given that there is so much written about Africa which is entirely negative."
"The modern mind tends to be more and more critical and analytical in spirit, hence it must devise for itself an engine of expression which is logically defensible at every point and which tends to correspond to the rigorous spirit of modern science."