Emerson says that "it is not words only that are emblematic; it is things which are emblematic. Every natural fact is a symbol of some spiritual fact. Every appearance in nature corresponds to some state of mind."
I've known many people who feel that nature speaks to us. And I think that if we pay close enough attention, we can learn from nature and see it's messages. We can also link nature, as Emerson says, to our own emotions and actions.
"A lamb is innocence; a snake is subtle spite; flowers express to us the delicate affections. Light and darkness are our familiar expression for knowledge and ignorance; and heat for love."