Knowledge.
Just as neuropeptides flow among the cells of the body, causing all the receptors to vibrate in response to information, so does knowledge act on our consciousness the way the strings of a resting violin are set to vibrating when another violin is played. Knowledge produces resonance among different people who are Unique, but Unified in their diversity. With knowledge we can truly feel what others feel - not just assume that they feel what WE feel. The oneness of Life is based on the simple fact that with knowledge, we are all vibrating together.