How would you know that the source was transcendent?
Ah this is the age old question about substance and where is the line between the material and immaterial. The Mind/Body Duality or mind over matter.
Some areas of science are even toying with the idea of an Information or Mind s fundemental. What exactly is transcedent.
What about phenomenal belief. Is that real and transcedent. What about conscious experiences. What if conscious experiences of nature and reality which is a direct experience of what is happening and not a 3rd party measure.
What if these experiences allow a deeper knowledge of reality that allowed ancients to discover how to manipulate it. Is that not how nature is designed. That becoming part of that nature or one with the world you are therefore becoming part of it more fully and able to experience and know it better.
Mary could not know the experience of colors like red. When she did she came to know and understand something about reality that all her academic knowledge could not tell her. This was new knowledge and insight into nature and reality.
By the same logic if the ancients were more immersed in the direct experiences of nature and reality they would also come to know similar knowledge about reality that material science could not rteveal. Which enable them to utilise and manipulate it.