Hope and purpose in this world is living as best as you can and maybe having life that gives back. But simply giving back isn't purpose; it's a branch of purpose, but it is not the trunk or root of the tree.

This quote suggests that the main purpose of life is to live as well as possible, and to give back to the world. Giving back, such as volunteering or helping others, is a part of living a purposeful life, but it is not the most important part. Instead, living life in a meaningful way, such as having meaningful relationships, pursuing meaningful work, and connecting with nature, are all more important than simply giving back.