Never complain and never explain.
Be thine own palace, or the world's thy jail.
The wise does at once what the fool does at last.
If you're going through hell, keep going.
Only the educated are free.
The dog that trots about finds a bone.
The secret of getting ahead is getting started.
Quality is not an act, it is a habit.
Without hard work, nothing grows but weeds.
If you can dream it, you can do it.
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.