The good may not be the best. When it is the enemy of perfect, though, you have a problem.
Sometimes things have to get done. In those cases it makes sense to choose the good.
If the good becomes hostile to the ultimate perfect, though, it can trap you in a uncomfortable position.
The idea of unshakable belief is like that “good.” It can help you get some things done, even many things, but it can prevent your brain from connecting the dots and realizing a superior truth.
Keep your mind open.