Jim Yurchenco : Reflecting on 35 Years at IDEO

Don't accept done for good, and don't accept good for excellent.

One of the most important things a really good designer does, is excercise a large amount of self criticism.
That you are able to look at your own work and figure out whats not right about it, and what can i do to make it better.

Don’t accept done for good, and don’t accept good for excellent.