Of course, it is the one and only
Bhagavad Gita
Brought up as a
TamBram I knew the verses of
Bhagavad Gita coz of the non-stop chanting via the home Cassette player.
Quoting
Bhagavad Gita is almost synchronous with referencing the ultimate axiom of living.
Every one who values anything has learnt it the hard way the value of it or is associating a value based on perception.
It is serendipitous that I was brought up in
Roha where
Swadhyay, the way of living discovering the Gita is followed prominently.
A wise person knows, it is a short lifetime to learn by doing all the mistakes so it is good to learn from the mistakes of others. That is the reason they put in efforts to learn from the existing literature and perceive the world around them based on their observation with limited exposure.
The wiser the person gets the more importance is giving to classics whose lessons are priceless and stand the test of time. Bhagavad Gita is one such classic.
Leaving aside the mythology, the gist of it is so omnipotent that I believe it is the ultimate decision guide for the living soul.
You are unhappy, read
Bhagavad Gita
You are feeling sad, emotional, confused, depressed, read and follow
Bhagavad Gita
Take your time. Read, understand, experiment and enjoy.