Better is the enemy of best.

We do what we think we can do. We don’t attempt what we think we are incapable of.

In art the best is good enough.

Just because something is good is not a sufficient reason for doing it. The number of good things we can do far exceeds the time available to accomplish them. Some things are better than good, and these are the things that should command priority attention in our lives.

If the best is possible, than good is never enough and only do the best.

You can only do your best. That's all you can do. And if it isn't good enough, it isn't good enough.