Note: I am not spiritually well read. I was not much interested in spiritual knowledge and was more interested to spiritual realizations. So, I tried to self-reflect and imbibe the selected books, to which I resonated the most, through mediation and solitude rather than going after lots of books. Therefore, the book recommendations given here is out of limited books which I have read during my spiritual journey but I am sure that there would be numerous other good books on this matter. However, as per my experience, these books, if resonate with you, combined with meditation practice, would help you a lot on the path of self-discovery.