Thought means life, since those who do not think so do not live in any high or real sense. Thinking makes the man. – Amos Bronson Alcott

Thoughts of themselves have no substance; let them arise and pass away unheeded. Thoughts will not take form of themselves, unless they are grasped by the attention; if they are ignored, there will be no appearing and no disappearing. – Ashvaghosha

Thinking more than others about our own thoughts is not self-centeredness. It means that if asked whats on our mind, we are less likely to mention being aware of the world around us, and more likely to mention our inner reflections. But we are less likely to mention thinking about other people. – Elaine N. Aron