The concept of karma in Hinduism developed and evolved over centuries. The earliest Upanishads began with the questions about how and why man is born, and what happens after death. As answers to the latter, the early theories in these ancient Sanskrit documents include pancagni vidya (the five fire doctrine), pitryana (the cyclic path of fathers) and devayana (the cycle-transcending, path of the gods). Those who do superficial rituals and seek material gain,claimed these ancient scholars, travel the way of their fathers and recycle back into another life; those who renounce these, go into the forest and pursue spiritual knowledge, were claimed to climb into the higher path of the gods. It is these who break the cycle and are not reborn. With the composition of the Epics - the common man's introduction to Dharma in Hinduism - the ideas of causality and essential elements of the theory of karma were being recited in folk stories.