Mind and brain are two confused entities. We do not know who thinks; mind or brain? Thinking just happens. Brain is the hardware and mind is the software. And our lovely heart adds emotion to thoughts. But who is the thinker? He is there; but nobody has seen him. He always remains invisible. We know the effects; but the cause remains unrevealed to us. But, we know that for every effect, there should be a cause even though we cannot perceive it. The thinker is there. He is the only one without a cause. He is the first cause and is the one without a second.