Final answer:
The fundamental premise in Qoheleth's philosophy likely relates to the historical philosophical debate on the nature of change versus permanence and the pursuit of the foundation for morality and meaning in life.
Step-by-step explanation:
The fundamental premise that became the mediating element in Qoheleth's philosophy is challenging to pinpoint with precision because Qoheleth's exact philosophical positions are not detailed in the provided texts. However, examining historical philosophical exploration from Socrates to Maimonides and the Pre-Socratics, some common threads can be discerned. One fundamental premise that seems to arise frequently is the tension and interplay between change and permanence: Heraclitus's embrace of constant flux versus Parmenides's notion of unchangeable reality. Socrates used critical reasoning to seek a foundation for morality and social order beyond the Greek pantheon, while the Pre-Socratics contributed to philosophical thought by postulating material principles as the basis of reality, despite their ideas later being considered incorrect. In light of these perspectives, the fundamental premise in Qoheleth's philosophy could likely involve a similar engagement with the nature of reality and ethics, interweaving metaphysics with practical considerations of life's meaning and morality.