The longer we dwell on our misfortunes, the greater is their power to harm us.

I know that I am intelligent, because I know that I know nothing.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

Many are they who have a taste and love for drawing, but no talent; and this will be discernible in boys who are not diligent and never finish their drawings with shading.

Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged.