Below is a link to a 58-minute audio/video (available on YouTube) by the Sufi master, Pir Vilayat Khan, under whom I once studied, on the nature of the Reality. It is presented in Sufi/Islamic terminology with parallel references to Hindu terminology equivalents with some references to other religions as well. Although it goes very deep, it is also very understandable.
If this resonates, then I would recommend the book, "The Message in our Time" by Pir Vilayat Khan about his father, the Sufi Mystic Hazrat Inayat Khan. That book is one of my favorites even today.
https://www.youtube.com/watch?v=IC0TD_g29GU
EDIT: Below is the link to the book, "The Message In Our Time", as mentioned above in my post.
https://www.amazon.com/Message-Our-T.../dp/0930872045