Scriptures are also called ‘Grantha-ratna’. The deeper you dive, the knowledge you will discover will be most precious, cause that gemstone is Krsna Himself.
If you want to be a thinker, highest thinker, think in terms of Bhagavatam or Bhagavad- gita. Have input from Gita and Bhagavatam, you will be the best thinker, the topmost thinker of this world.
All that you need to know, not only about the soul, the supreme soul, but everything about the management, about ruling the country, about cooking , about the architect, about chemistry, physics everything that you need to know is right there in the Shastras.
If those who live in Bharatvarsha, rigidly follow the principles of Varnashram dharma and develop their dormant Krishna Consciousness, they need not return to this material world after death.