I have frequently gained my first real insight into the character of parents by studying their children.

It is a capital mistake to theorize before one has data.

As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after.

The lowest and vilest alleys of London do not present a more dreadful record of sin than does the smiling and beautiful countryside.