All thoughts can reach, touch, only thoughts.
Memory is a bundle of thoughts. Ideas are thoughts. Thought will not awaken you. No amount of reading or studying others thoughts will bring you to your natural Self. Thought can help one understand the nature of thoughts, that is all. The separate personal I is simply a bundle of thoughts. Look deeply at thought (how it arises & where it comes from) and see/know that you are not thought. Ahhhhhh....free!