useful
A golden rule that will fit everything
“If you want a golden rule that will fit everything, this is it: Have nothing in your houses that you do not know to be useful or believe to be beautiful.” ~William Morris
Narrowness of Thought
For purposes of action nothing is more useful than narrowness of thought combined with energy of will.
~ Henri Frederic Amiel
A life spent making mistakes
A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing. ~ George Bernard Shaw