Without your joy, His joy is incomplete.
Without your smile, the world cannot be saved."
I think we can't add much to this phrase. Just remember how essential we are within the divine plan when we occupy our roll with joy and enthusiasm.
Many of us grew up under the mantle of a philosophy of life that considered sacrifice and suffering to be commendable, because in some way it seemed that there was a God who was more pleased if we lead an austere, serious life, full of sacrifices because that way we would earn a little place in a "heaven" full of rewards. So a life of joy, smiles, and happiness, somehow meant that we were already missing some future prize.
When I finally discovered that the Creator experiences through our experiences, I realized that it was our obligation to experience, create, see, enjoy, travel, feel and live intensely every moment of our existence.
As Wallace D. Wattles said, "God, the One Substance, is trying to live and do and enjoy things through humanity. He is saying, "I want hands to build wonderful structures, to play divine harmonies, to paint glorious pictures, I want feet to run my errands, eyes to see my beauties, tongues to tell mighty truths and to sing marvelous songs, and so on..."