I am content to follow to its source Every event in action or in thought; Measure the lot; forgive myself the lot. When such as I cast out remorse So great a sweetness flows into the breast. We must laugh and we must sing, We are blest by everything, Everything we look upon is blest.
~ from "A Dialogue of Self and Soul" by William Yeats
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.