Bhagavad Gita: As it is.
Do not read the explanation which are biased to god and religion.
But you can definitely read the stanzas. The idea that we are actor whose duty is to act is a powerful concept, especially when you are feeling low.
The book also has some egoistic stuff like "I am god, obey me." But once you filter some of these, you see bigger picture.
I only came to know of the Gita by this quote: "To work you have the right, but not to the fruits thereof". Resonated with me, and brought me to the concept of "karma yoga".
How did you come across it?
"It is possible to commit no mistakes and still lose. That is not a weakness. That is life." - Jean-Luc Picard
Who Wrote the Bhagavadgita: A Secular Enquiry into a Sacred Text by Meghnad Desai https://www.goodreads.com/book/show/21454853-who-wrote-the-b...
Many people consider BG to be unchallenged book and that all it's ideas are good. But this book by Meghnad Desai opened my eyes and now I am disillusioned for the good.
* The Bhagavad Gita translated by W. J. Johnson and published in Oxford World's Classics. This is a good succinct translation in the spirit of the original.
* The Bhagavad Gita translated and interpreted by Franklin Edgerton (2 vols in one). Edgerton was a noted Sanskrit scholar and this translation contains a lot of background and detailed material in the form of illuminating essays.
The above two paired together will give you excellent insight into the text.