One can discuss the merits of a law of nature comfortably by a fireside.

But out there one realises how academic the discussion is, one obeys it.

The white man has always spread himself over the country of the black man, and we may take it he always will.

He has the pioneer's hankering after the uttermost corners of the earth, and in addition to that the desire to prosper.

He obeys both motives; they are of the essence of him.