They wanted to know what a heart was. We told them it was a muscular pump, so that they could feel comfortable in the knowledge that it was comprehensible. But the fact is, no one has ever known what a heart is. It is an electrostatic wonderland; there is no brain without it. One might just as well say ‘it is everything!’ But of course, most people consider it a component. Well, if it’s a component, you should consider its extent to be at least equivalent with the entire circulatory system. That, maybe, is a somewhat more actual component than the heart. But even that is more convenience than fact. The same is essentially true of the brain and nervous system, except, again, we run into the necessity of the other systems, respiratory and circulatory first amongst them. So, when you pare away the utilitarian inventions of biological science you discover that the heart is everything. The brain is, too. The convenience of distinction is compelling and useful, within appropriate contexts; but when it is mistaken as fact it becomes a lie.