Varahamihira

There are two kinds of reasoning deductive and inductive. The inductive reasoning is the method of finding out patterns by from a population of events, things or observations. This is the method of generalizing the observations and formulation of theories. For example when we observe that leaves of almost all plants are green, we conclude that the "leaves are green" - which is a generic statement cutting across different species of plants. On the other hand deductive reasoning is the method of applying a theory (generalized hypothesis) on a specific event or thing and predict the outcome of the observation. In the given example above, if there is a discussion about leaves, one would assume that the leaves under discussion will be green because that's the general idea that is arrived through inductive reasoning. The ability to reason rests with the fiery planets Mars and Ketu. We are aware of the famous dictum of Jyotish- Kujavat Ketu - which means Ketu is like Mars in man