Striving for excellence motivates you; striving for perfection is demoralizing.

By reading this quote you understand two things. First, never to give up trying to reach the tops as it motivates you continuously. Second, always be aware that perfection does not belong on earth. No one can ever be perfect, and no one is actually perfect… That is why pencils have erasers. There is nothing you can do about it, you just have to live with it, otherwise it becomes demoralizing.