"Perfection is not attainable, ..."
It emphasizes that while striving for flawlessness is a worthwhile pursuit, it's ultimately unattainable. However, by aiming for perfection, individuals can achieve a high level of achievement, or excellence.
Humans are inherently flawed and that achieving absolute perfection is an unrealistic goal. And there are the importance of having high standards and striving for the best possible outcome. While we may not reach perfection, the effort to attain it will lead to a high level of achievement and success.
The people who pursue their goals with determination and effort, even if they don't believe they can be perfect. But, the journey of striving for perfection is just as important as the final result.