Very few people understand the heart
In truth, your heart is one of the masterpieces of creation. It is a phenomenal instrument. It has the potential to create vibrations and harmonies that are far beyond the beauty of pianos, strings or flutes. You can hear an instrument, but you feel your heart. And if you think you can feel an instrument, it’s only because it touched your heart. Your heart is an instrument made of extremely subtle energy that few people come to appreciate.
Taken from the untethered soul (chapter 6 – the secrets of the spiritual heart)