If you establish a relationship with it then you have relationship with mankind. You are responsible then for that tree and for the trees of the world. But if you have no relationship with the living things on this earth you may lose whatever relationship you have with humanity, with human beings. We never look deeply into the quality of a tree; we never really touch it, feel its solidity, its rough bark, and hear the sound that is part of the tree. Not the sound of wind through the leaves, not the breeze of a morning that flutters the leaves, but its own sound, the sound of the trunk and the silent sound of the roots. You must be extraordinarily sensitive to hear the sound. This sound is not the noise of the world, not the noise of the chattering of the mind, not the vulgarity of human quarrels and human warfare but sound as part of the universe.