Assalamu Alaykum warahmatullahi wa barakatuh
I am currently reading Robert Greene’s laws of Human Nature and if I am to summarise the book I would say it is about how one should not succumb to his lower self and aspire to his or her Higher self.
I have been thinking about this lower self and Higher self thing and from an islamic perspective I believe one of the goals of Islam is to prevent us from succumbing to our lower selves.
From a scientific perspective, our lower selves are basically our remnants of evolution that keeps dragging us down to our animalistic ways. In psychological terms, I would say it is our subconscious trying to force us to succumb to our fears, insecurities and our life struggles.
These are all I believe manifestations of our lower selves.
Islam, i believe calls you to your higher self. Irrespective of your animalistic tendencies, or subconscious pull; Islam tries to pull you away from all of that and sets you on a path of enlightenment towards your higher self.
One of the goals of the book the author might argue is for man to be successful (in this life) by not succumbing to your lower self. On this note, I would like us to ponder upon this verse in suratun Nisa:

Wa’alaykumus salam warahmatullahi wa barakatuh, may the soul of my friend, Abubakar Abdulrahman continue to rest in peace. Ameen.