The Sufis have therefore considered the development of the heart quality as a spiritual culture, and have called it the culture of the heart. It consists of the tuning of the heart. Tuning means changing the pitch of the vibrations. Tuning the heart means changing the vibrations, bringing them to a certain pitch which is the natural one where you feel the joy and ecstasy of life, which enables you to give pleasure to others even by your presence because you are tuned. When an instrument is properly tuned you need not play music on it; just by striking it you will feel a great magnetism coming from it. If an instrument well-tuned can have that magnetism, how much greater should be the magnetism of hearts that are tuned.