Problems are not stop signs, they are guidelines.
Always desire to learn something useful.
After a storm comes a calm.
Wherever you are - be all there.
You never know what motivates you.
To be a good loser is to learn how to win.
If you can dream it, you can do it.
To know oneself, one should assert oneself.
Leap, and the net will appear.
Never complain and never explain.
There's obviously nothing wrong with selling your art - only an idiot with a trust fund would tell you otherwise. But it's confusing to know how far you should take it.