Yes, for example the Vedic texts were often interested in higher truth and reality, already in the Rgveda. E.g. RV 10.129:
The nonexistent did not exist, nor did the existent exist at that time. There existed neither the airy space nor heaven beyond. What moved back and forth? From where and in whose protection? Did water exist, a deep depth? Death did not exist nor deathlessness then. There existed no sign of night nor of day. That One breathed without wind by its independent will. There existed nothing else beyond that.
These questions and speculations are not related to the simple logic of ‘I burn some food and will get more sons in return’. Then of course the pre-Buddhist Brahmanas and Upanisads are full of abstract cosmogonies, philosophy and liberation-oriented teachings, including Yajnavlkya’s ‘neti neti’ etc.
Just from the top of my head… Again, it’s a good talk, but you know how it is, some people listen to it and think “The Bhikkhu must have studied it, so apparently that’s the best knowledge right now”.