The Global Impact of a Single Action

I'm reading Caroline Myss's recent book, Defy Gravity, in which she explores the myths and truths about spontaneous self-healing. This passage (page 20) took my breath away -- it is such a powerful truth:
"Consider that we are living at a major turning point in the history of humanity, a time of great crisis and great opportunity. It may be unreasonable to imagine that you can make a difference to a world in crisis based on how you undertake undertake your own healing, yet I believe this to be true. It makes no sense to our logical minds that as we heal, the whole of life heals. Yet the power of one mustard seed can move a mountain; the power of one clear light does illuminate the darkness; the power of a person devoted to truth becomes a channel for healing grace that benefits all humanity. No matter what you heal within yourself, from a negative thought to a progressive cancer, the very act of healing has in some way made a difference to everyone on the planet. It is a truth that goes beyond the bounds of ordinary reason, but so does all mystical truth, and that is why such truth has the power to heal."