To be termed scientific, a method of inquiry must be based on empirical and measurable evidence subject to specific principles of reasoning. (religion.blogs.cnn.com)
Since there was a «seed» of this cosmic principle of reason in each and every human being, humans, through the exercise of reason, could understand the nature of reality and seek «the good life.» (religion-online.org)
This was an objectivist understanding; the cosmic principle of reason, the logos, was writ large in the universe, and it was up to human beings, through the exercise of their rational capacities, to discover it. (religion-online.org)