Don’t misinterpret this beautiful and instructive poem. Joy and woe are not opposites that are connected. Separating them reinforces the illusionary pursuit of what we want over what we have. They are complementary and  interdependent, “woven” together. One does not follow the other but is contained within the other. Not about karma or some equalizing force. Every woe is threaded with “silken twine” and every joy has “grief and pine”. Reminds me of “tears of joy” or Michael Franks lyric, “I am so happy I am sad.” Once we see this, the blending of these emotional forces and energies, we have more equanimity. Real balance in life is understanding this. Everything is impermanent and contains its own beginning and end.