To be a good loser is to learn how to win.
To know oneself, one should assert oneself.
Only the educated are free.
By failing to prepare, you are preparing to fail.
After a storm comes a calm.
Quality is not an act, it is a habit.
You never know what motivates you.
The dog that trots about finds a bone.
Without hard work, nothing grows but weeds.
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.