The existence of these two qualities, prudence and self-control, is a very important factor in human character, and upon their presence and prevalence in its units depend the progress and stability of society. But the birth-rate varies in an inverse ratio with these qualities. In those communities or sections of communities, where these qualities are conspicuous, will the birth-rate be correspondingly low.
There is another class of people that has strong desires to keep free from the cares and expense of a large family. These are, too, good citizens and belong to good stock. They are those possessed of ambition to rise socially, politically, or financially, and they are a numerous body in New Zealand.
They are quite able to support and educate a fairly large family, but as children are hindrances, and increase the anxieties, the responsibilities and the expense, they must be limited to one or two.
There is still another class that consists of the purely selfish and luxurious members of society, who find children a bother, who have to sacrifice some of the pleasures of life in order to rear them.
Now all those who prevent have some rational ground for prevention, and at least are possessed of sufficient self-control to give effect to their wish. They include the best citizens and the best stock, and from them would issue, if the reproductive faculty were unrestrained, the best progeny.
One grave aspect of this limitation is that, as a rule, the family is limited after the first one or two are born. The small families, say of two, are born when the parents are both young, and carefully compiled statistics prove that these are not the best offspring a couple can produce. Those born first in wedlock, are shorter and not so well developed as those born later in married life, when parents are more matured.
If it is substantially true, that the decline in the birth-rate is due to voluntary prevention, and that prevention implies prudence and self-control, it is safe to conclude that those in whom these qualities are absent or least conspicuous, will be the most prolific.
But those in whom these qualities are absent or least conspicuous are our worst citizens, and, therefore, our worst citizens are the most prolific. Observation and statistics lead to the same conclusion.
Amongst the very poor in crowded localities, the passion for marriage early asserts itself.
Its natural enemies are prudence and a consciousness of responsibility, and these suggest restraint. But prudence and restraint are not the common attributes of the very poor. Poverty makes people reckless, they live from hour to hour as the lower animals do. They satisfy their desires as they arise, whether it be the desire for food or the desire of sex.