"The test of any accomplishment is how self-critical you can be. If you can’t be self-critical, you may do something that’s pretty good but you’ll never be able to make it any better ... if you’re not able to ... attack your first effort and break it down and build it up." ~ John Irving
I love that word, "attack." I constantly attack my work. It’s enjoyable, even! Sometimes aggravating. But if you don’t keep pushing yourself, then how are you going to get better? The day I can’t see my faults is the day I’ll fear I can’t get any better.
The link above has a full-length interview, starting at about the twenty minute mark. The video below is just a short dose of inspiration on being a "craftsman." There’s more John Irving here.