"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?"

This quote by Douglas Adams is a commentary on the propensity of people to try to find more than what is in front of them. He is suggesting that it suffices to appreciate the charm of a garden without requiring to think in something that can not be seen or proven. He is indicating that it is not needed to search for something beyond what is visible in order to value the appeal of the garden. He is also recommending that it is not necessary to believe in something that can not be shown in order to take pleasure in the appeal of the garden. Adams is motivating us to appreciate the beauty of the garden without needing to believe in something that can not be seen or proven. He is recommending that it suffices to merely value the beauty of the garden without requiring to believe in something that can not be seen or shown.