Simplicity, clarity, singleness: These are the attributes that give our lives power and vividness and joy as they are also the marks of great art. They seem to be the purpose of God for his whole creation.

The quote talks about the beauty of having simplicity and clarity (being straight-forward) in our lives. It mentions that these qualities give us power and make us happy, and that the same qualities are used in great art. Finally, these qualities are likely part of God’s plan for the world. In other words, the quote suggests that having simplicity and clarity in our lives and in works of art leads to fulfillment.