One of my favorite books is "The Giving Tree" by Shel Silverstein. I enjoyed the simple story and pictures as a child, but only as an adult have I truly appreciated the deeper meaning of the book.
The tree that continues to give to the boy, first her apples and leaves, then her branches, and finally her trunk, is reflective of nature overall. Nature gives and gives and gives and asks for nothing in return. Even when the tree seemingly has nothing left to give, she offers her stump as a resting place for the boy who has taken everything.
We can all learn something from the tree and from nature in general. If everyone tried to give to others the world would be a better place. And for those who do give it's important to realize we can always give a little more. We should be aware of what we take. It's easy to take nature for granted but the growing body of evidence around climate change and nature deficit disorder shows that we forsake the natural world only at our own peril.