To the sober person adventurous conduct often seems insanity.

Earthworms are the intenstines of the soil.

One would have thought that it was even more necessary to limit population than property; and that the limit should be fixed by calculating the chances of mortality in the children, and of sterility in married persons. The neglect of this subject, which in existing states is so common, is a never-failing cause of poverty among the citizens; and poverty is the parent of revolution and crime.

Happiness is something final and complete in itself, as being the aim and end of all practical activities whatever .... Happiness then we define as the active exercise of the mind in conformity with perfect goodness or virtue.

Everybody loves a thing more if it has cost him trouble: for instance those who have made money love money more than those who have inherited it.

Wonder implies the desire to learn.

For good is simple, evil manifold.