“Perfection is a trifle dull. It is not the least of life’s ironies that this, which we all aim at, is better not quite achieved.” — W. Somerset Maugham
The quote is saying that even though people strive to be perfect, actually being perfect is not interesting. The irony is that the pursuit of perfection does not imply that achieving perfection is the goal.
For me, this rings similar to Emerson's quote: "Life is a journey, not a destination."