A great emigration necessarily implies unhappiness of some kind or other in the country that is deserted.

I feel like one / Who treads alone / Some banquet-hall deserted, / Whose lights are fled, / Whose garlands dead / And all but he departed!

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.

He . . . felt towards those whom he had deserted that peculiar malignity which has, in all ages, been characteristic of apostates.

In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known.

No man can be happy without a friend, nor be sure of his friend until he is unhappy.