Man can only endure a certain degree of unhappiness; what is beyond that either annihilates him or passes by him and leaves him apathetic

Neither art thou the man to catch the fiend and hold him! [Ger., Du bist noch nicht der Mann den Teufel festzuhalten.

For many people, one of the most frustrating aspects of life is not being able to understand other people's behavior.

How many years you have to keep on doing, until you know what to do and how to do!

You acquire a language most readily in the country where it is spoken; you study mineralogy best among miners; and so with everything else.

Every decided colour does a certain violence to the eye, and forces the organ to opposition.

One usually thinks people to be more dangerous than they are.