The great and unlooked for discoveries that have taken place of late years have all concurred to lead many men into the opinion that we were touching on a period big with the most important changes.
The main peculiarity which distinguishes man from other animals is the means of his support-the power which he possesses of very greatly increasing these means.
The power of population is indefinitely greater than the power in the earth to produce subsistence for man.
A great emigration necessarily implies unhappiness of some kind or other in the country that is deserted.
I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.
Jika populasi dan makanan meningkat dalam rasio yang sama, ada kemungkinan bahwa manusia mungkin tidak pernah muncul dari keadaan buas.