Some scientists have said that the brain is a substance that produces thought. But the brain could never be large enough to contain the whole of thought. The brain receives the vibrations from the mind invisible, and the heart receives the vibrations from the heart invisible. If we think very much, we hold our head. The head becomes heavy. Scientists do not give the heart any importance as an organ of feeling. They say that it is simply an organ that helps in the circulation of the blood. Really the physical heart receives the impressions from the heart invisible. A feeling of joy or pleasure is not felt in the brain. It is felt in the chest, and especially in the left side, where the heart is. A feeling of fear is not felt in the brain, but in the place of the heart. A feeling of depression or sadness causes a heaviness in the chest.