It is an undeniable privilege of every man to prove himself right in the thesis that the world is his enemy; for if he reiterates it frequently enough and makes it the background of his conduct he is bound eventually to be right.

Heroism is endurance for one moment more.

...there is an optimal balance, depending on the manner of man's life, between the density of human population and the tolerances of nature. This balance, in the case of the United States would seem to me to have been surpassed when the American population reached, at a very maximum, two hundred million people, and perhaps a good deal less.

It is an undeniable privilege of every man to prove himself right in the thesis that the world is his enemy; for if he reiterates it frequently enough and makes it the background of his conduct he is bound eventually to be right.

There is more respect to be won in the opinion of this world by a resolute and courageous liquidation of unsound positions than by the most stubborn pursuit of extravagant or unpromising objectives.

It is obviously easier, for the short run, to draw cheap labor from adjacent pools of poverty...than to find it among one's own people. And to the millions of such prospective immigrants from poverty to prosperity, there is, rightly or wrongly, no place that looks more attractive than the United States. Given its head, and subject to no restrictions, this pressure will find its termination only when the levels of overpopulation and poverty in the United States are equal to those of the countries from which these people are now so anxious to escape.

A political society does not live to conduct foreign policy; it would be more correct to say that it conducts foreign policy in order to live.