No move towards the extinction of the passion between the sexes has taken place in the five or six thousand years that the world has existed.

Capitals accumulate faster than population

When Hume and Adam Smith prophesied that a little increase of national debt beyond the then amount of it, would probably occasion bankruptcy; the main cause of their error was the natural one, of not being able to see the vast increase of productive power to which the nation would subsequently obtain.

Population trends have always provoked doom-fraught oracles, because their popular interpreters suppose that every new series will be infinitely sustained; yet, beyond the short term, expectations based on them are never fulfilled.

The moon is not kept in her orbit round the earth, nor the earth in her orbit round the sun, by a force that varies merely in the inverse ratio of the squares of the distances.

In general it may be said that demand is quite as necessary to the increase of capital as the increase of capital is to demand.

It has been said, and perhaps with truth, that the conclusions of Political Economy partake more of the certainty of the stricter sciences than those of most of the other branches of human knowledge.