An open heart is an open mind. Well, not literally of course; they're two separate things. And just what is the mind exactly? Are the mind and the brain the same thing? I think the brain is a thing, but the mind is more of an idea, a concept, really. The brain is home to the mind and, like love and marriage, you can't  have one without the other. Or can you? Hmmmm. Food for thought. If you have a mind. Or a brain. Keep an open heart on the subject.