To the person with a firm purpose all men and things are servants.
Time flies, and what is past is done.
Objects in pictures should so be arranged as by their very position to tell their own story.
If you want to make life easy, make it hard.
It is in self-limitation that a master first shows himself.
Man is not born to solve the problem of the universe, but to find out what he has to do; and to restrain himself within the limits of his comprehension.