A good start to a discussion of thought is the question of the understanding of it. Thoughts are mental concepts whose reality are just that, they are merely patterns of mental energy meant to represent reality or some aspect of reality. Do understand that they are NEVER that reality they are meant to represent, the REAL is always on the other side of conceptual thinking. If one wants to be free from confusion of the mind, one must first understand the mind and its inherent 'illusionary' thinking nature.