To know oneself, one should assert oneself.
Either you run the day or the day runs you.
Well done is better than well said.
The wise does at once what the fool does at last.
Expect problems and eat them for breakfast.
Who seeks shall find.
I can, therefore I am.
Never complain and never explain.
Begin to be now what you will be hereafter.
If you're going through hell, keep going.
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.