My interest in ancient cultures is how those people coped with life. Gilgamesh, torah, Aesop's fables, 1001 Arabian nights are interesting to me for how each culture dealt with and documented the human condition and social interactions.
To me Sun Tzu writings and all the ancient writings are about preparing one's "mind" for an attitude that can be used to cope. The commonality of story to a culture strengthens the social structure. The commonality is used to apply old wisdom to seemingly new and complex events. These writings become the common thread.
>the ancient writings are about preparing one's "mind" for an attitude that can be used to cope [with whatever Life may throw at you]
This is exactly it!
One of my interests is the study of "Worldly Wisdom"(have a bunch of books from different cultures in my collection) categorized into;
1) "Idealistic"(Ethical/Moral) - Lots of Philosophies/Holy Books/etc. deal with this.
2) "Realistic/Pragmatic"(the World as it is and not how you would like it to be) - These are the common books of Wisdom/Aphorisms/Quotes/etc. from Culture/Daily Life.
3) "Crooked/Cynical"(how to further self-interest/getting-back on wrongs) - These are books on Strategy/Kingship/etc.
I find it quite transformational studying this subject since it teaches one all aspects of dealing with/making sense of Life. With the ascendancy of Scientific thought and decline of traditional Religions it has become even more necessary for each of us to chart our own ways with whatever advice (adapted to Modern Science/Times) we can glean from these ancient texts.
I have a good collection of books on the topic of "Worldly Wisdom". Most books will span the categories and you have to tease their teachings into the above three buckets. When reading these books always remember that they were written in a specific Context/Time and hence would need reinterpretation in your specific context before application. Also as much as possible go to the original sources/authoritative translations instead of "popular" accounts of the same which are almost always dumbed down and virtually useless. The essence is in understanding the nuances and not the obvious "sound bite".
Here is a partial list in no specific order (lookup their reviews on Amazon/elsewhere on the web for details);
1) The Pocket Oracle and Art of Prudence by Baltasar Gracian translated by Jeremy Robbins. This book is also available as "The Art of Worldly Wisdom" translated by many others. Of these the one by Christopher Maurer is noteworthy.
2) A Pocket Mirror for Heroes by Baltasar Gracian translated by Christopher Maurer.
3) The Prince by Niccolo Machiavelli. Of the many translations, the one by Peter Bondanella in Oxford World's Classics is noteworthy.
4) Maxims and Reflections (Ricordi) by Francesco Guicciardini translated by Mario Domandi.
5) The First Great Political Realist: Kautilya and His Arthashastra by Roger Boesche - A very nice summary of the magnum opus "Arthashastra" from Ancient India.
6) King, Governance, and Law in Ancient India: Kautilya's Arthasastra translated and annotated by Patrick Olivelle - A very good and modern translation of a large text.
7) The Essence of Politics (Sanskrit: Nitisara) by Kamandaki translated by Jesse Ross Knutson - A shorter Ancient Indian text in the vein of Arthashastra.
8) The Pancatantra: The Book of India's Folk Wisdom translated by Patrick Olivelle.
9) Tirukkuṟaḷ by Tiruvalluvar (see https://en.wikipedia.org/wiki/Kural for details) - For a good English translation see the one translated by P.S.Sundaram and published in Penguin Classics.
10) The Art of War by Sun Tzu translated by Ralph D. Sawyer.
11) The Seven Military Classics of Ancient China translated by Ralph D. Sawyer.
12) [The Complete] Book of Five Rings by Miyamoto Musashi translated by Kenji Tokitsu.
I have left out the obvious works by Epictetus/Seneca/Cicero/Marcus Aurelius/etc. since they are all well known.
The above is a good representative of the three categories drawn from different cultures and should get you started.
To me Sun Tzu writings and all the ancient writings are about preparing one's "mind" for an attitude that can be used to cope. The commonality of story to a culture strengthens the social structure. The commonality is used to apply old wisdom to seemingly new and complex events. These writings become the common thread.