As true as it gets

perfectionism makes you less efficient

It also hurts your feelings, perfection being abstract, subjective and therefore unattainable.
What does the perfect horse/tree/essay/novel looks like?
Allegedly it possesses all the qualities granted by its nature, as Aristotle would say. But, What is the nature of a horse/tree/essay/novel?
It's sleepery. If we ask 100 people to draw the perfect tree, we will get 100 different trees (although if we are unlucky enough to gather 100 neurotic perfectionists we may never get any tree). :)