Consciousness is a topic that truly gave birth to the field of psychology from the already established field of philosophy. As William James put it, consciousness is in fact not a brick wall. It is not a single whole thought comprised of many small thoughts. Instead, a more appropriate metaphor is it being a stream. One thought flows into another thought which flows into yet another thought. Although each idea is traveling, it remains still a stream or a entire body of water while constantly moving.
Even now, you are reading my blog post and thinking whatever thought possesses your mind at the present time. Whatever this idea in your head may be, it will soon be gone. If not now, then in ten minutes. If not in ten minutes, then in an hour. All thoughts come and go, yet they are still a part of your entire consciousness. Surely, in an hour or perhaps even tomorrow, you will be able to recall these thoughts that you possess currently, for your consciousness, although moving, is comprised of all thoughts that have come and gone in your life.