It really boils down to this: that all life is interrelated. We are all caught in an inescapable network of mutuality, tied to a single garment of destiny. Whatever affects one directly, affects all indirectly.
If you wish to make anything grow, you must understand it, and understand it in a very real sense. ‘Green fingers' are a fact and a mystery only to the unpracticed. But green fingers are the extensions of a verdant heart.