Il semble que la perfection soit atteinte non quand il n'y a plus rien à ajouter, mais quand il n'y a plus rien à retrancher.
(Antoine de Saint-Exupery, Terre des Hommes, 1939).

[Perfection is finally attained not when there is no longer anything to add, but when there is no longer anything to take away.
(translation by Lewis Galantière)]

A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.
The new hacker's dictionary, Eric S. Raymond, 1996