Learning is not done to you, it is something you choose to do.

By all means, fire the customers who aren't worth the time and the trouble. But understand that the moment you insist the customer is wrong, you've just started the firing process.

A customer is never out of warranty, even if his product is.

Habits are where our lives and careers and bodies are made.

Part of leadership (a big part of it actually) is the ability to stick with the dream for a long time.

Do your art. But don't wreck your art if it doesn't lend itself to paying the bills. That would be a tragedy.

If you're not willing to get your 'worst one ever' out of the way, how will you possibly do better than that?