Surfing is kind of a good metaphor for the rest of life. The extremely good stuff - chocolate and great sex and weddings and hilarious jokes - fills a minute portion of an adult lifespan. The rest of life is the paddling: work, paying bills, flossing, getting sick, dying.
The Qur'an does not ask for human perfection, but rather asks that we persevere in striving for self-improvement and that we never become complacent or despondent about our progress.