To be a good loser is to learn how to win.
Without hard work, nothing grows but weeds.
Who seeks shall find.
The most effective way to do it, is to do it.
By failing to prepare, you are preparing to fail.
Things do not happen. Things are made to happen.
If you're going through hell, keep going.
Expect problems and eat them for breakfast.
Know or listen to those who know.
Be thine own palace, or the world's thy jail.
That's something I learned in art school. I studied graphic design in Germany, and my professor emphasized the responsibility that designers and illustrators have towards the people they create things for.