You probably wouldn't worry about what people think of you if you could know how seldom they do

I have come to the conclusion that politics are too serious a matter to be left to the politicians -- Charles De Gaulle (1890 - 1970)  

The cure for boredom is curiosity. There is no cure for curiosity -- Dorothy Parker (1893 - 1967), (attributed)  

I do not want people to be agreeable, as it saves me the trouble of liking them -- Jane Austen (1775 - 1817)
 
Every person takes the limits of their own field of vision for the limits of the world -- Arthur Schopenhauer (1788 - 1860)