Once upon a time, Plato said that "…why should we not calmly and patiently review our own thoughts, and thoroughly examine and see what these appearances in us really are" (Theaetetus, 155). This is introspection. It is the self-observation of our inner thoughts, desires and sensations. A different way to examine one's own thoughts, feelings and even our soul. Living in a rush doesn't help us, and sometimes, it's good to stop and try to analyse what we had done and what we'll do in the future. Not only does it allow us to check our thoughts and plans but also to be responsible for them. In this way, introspection plays a key role in this and many other arguments relating to the mind-body problem.