The best are human beings too! I mean even the best work in two ways. Build on best principles already known, and make your own best principles. The first depends on how much you know, how much time you have taken to learn, implement, practice and perfect. The second depends on how far you can see.

In either case you can always overlook or fail to predict the even the easily foreseeable future. And that happens due to many reasons plain human error, or even over confidence which is some times the case with the best.

The best way out of this problem is what Jeff Atwood had blogged some time days back. Is to keep failing, and keep failing in different ways. And each failure needs to be translated into to lessons of some sort and then the solution of it a best practice. Even the Netflix model of failing purposefully will do.

There is no way the best can be flawless. Nothing is flawless, so as long it is done by a human.