This quote by E. Stanley Jones speaks to the idea that life is inherently enough. It suggests that life is currently equipped with the necessary resources to live a fulfilling life. This might mean that life is currently geared up with the required tools to be effective, or that life is currently filled with pleasure and satisfaction. It could likewise mean that life is already loaded with love and empathy, and that we don't need to look for these things outside of ourselves. Eventually, this quote is a pointer that life is currently filled with what we need, and that we don't need to look in other places for satisfaction. It encourages us to appreciate the life we have and to make the most of it.
"Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday"