Important for the scientific and philosophical mode of thought is the issue of circumstances that lead to the emergence of such type of reflection, different from traditional ways of explaining the reality by mythological beliefs. The spiritual search of a philosophising man turned out to be a reflection upon rule, upon the all-governing principle, i.e. both the natural world (cosmos) and the relations between people. This mode of thought evolved when a need and possibility for writing down (setting out) abstract legal norms (nomos) for the sake of certainty and verifiability of judgments arose. It was vital also for the trade and in particular for ownership (civil law), whose value was abstractly expressed in monetary money. These were the crucial factors in the initiation and development of scientific and philosophical (abstract) thought. Other fundamental conditions for the development of science and philosophy included liberty, equality and respect for otherness, as well as the non-orthodox character of beliefs (myths). These were ensured by the civic, cosmopolitan and economically developed polis, particularly the democratic one. Such conditions for the development of science and philosophy have proved to be universal and timeless.