The two most important days in your life are the day you are born and the day you find out why.
— Mark Twain
We fail more often because we solve the wrong problem than because we get the wrong solution to the right problem.
— Russell Ackoff
Happiness does not come from doing easy work but from the afterglow of satisfaction that comes after the achievement of a difficult task that demanded our best.
— Theodore Isaac Rubin
Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things only hoped for.
It requires wisdom to understand wisdom: the music is nothing if the audience is deaf.
— Walter Lippmann