... no one ever considers himself expert if he really knows his job. A man who knows a job sees so much more to be done than he has done, that he is always pressing forward and never gives up an instant of thought to how good and how efficient he is. Thinking always ahead, thinking always of trying to do more, brings a state of mind in which nothing is impossible. The moment one gets into the "expert" state of mind a great number of things become impossible.
Money may be the husk of many things, but not the kernel. It brings you food but not appetite; medicine, but not health; acquaintances, but not friends; servant, but not loyalty; days of joy, but not peace or happiness.
Patience serves as a protection against wrongs as clothes do against cold. For if you put on more clothes as the cold increases, it will have no power to hurt you. So in like manner you must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.
-Leonardo da Vinci (1452-1519) Artist, architect and engineer Cited in BITS & PIECES BITS & PIECES: Home Delivery 2001/08/16
Or as Herr Kemper is wont to say, 'Patience is a virtue.'
Associate with well-mannered persons and your manners will improve. Run with decent folk and your own decent instincts will be strengthened. Keep the company of bums and you will become a bum. Hang around with rich people and you will end by picking up the check and dying broke.