The deepest problems of modern life derive from the claim of the individual to preserve the autonomy and individuality of his existence in the face of overwhelming social forces, of historical heritage, of external culture, and of the technique of life.

A people without children would face a hopeless future; a country without trees would face a future with even less hope.

解释：不注意天时，财富就不能增长；不注意地利，粮食就不会充足。

最重要的胜利是在最艰难的失败之后到来的。

中心地的等级越高，其服务的区域越大，此类中心地的数量越少。