Many of us who seek God are perfectionists. We want to be as good as possible. What's wrong with that?
Let's consider one area where we could excel: the world of knowledge and facts. When it comes to facts, we make every honest effort to be accurate. Accuracy is a good goal; it shouldn't lead us wrong. But the quest to be error-free can lead to fault-finding.
When it comes to people -- including ourselves -- the risk is much greater. The quest to be error-free can lead our minds to cultivate a constant stream of evaluations and judgments. A perfectionist attitude looks at our own actions (or those of others) to find something wrong. Perfectionism easily becomes an instrument of hurt, of attack. When perfection causes harm, perfection isn't even good.