Animals are the essence of existence. They only do what is necessary to survive and nothing more. To me, this represents purity and truth. Animals and plants are free from the bias and constraint humans are subjected to by society. Nature is true freedom.
Nature also exists for no purpose.
For me, this is the essence of life. Life doesn't need to have a purpose to exist. It is there just for the purpose of existing. I don't believe things happen for a reason, and nature embodies this idea. Nature is my belief, and my religion.