Changes

It was Plato, who made ''idea'' a technical term in philosophy, a world of abstract ideas [[idealism]]; Aristotle on the contrary, shows the real that dwells in the objects of sense; he thought that the natural world needed to be studied and observed for knowledge to be gained. His theory of act and potentiality, of form and ''matter'', is a new solution of the relations between the permanent and the changing; following the first attempts of the [[Presocratic Philosophy]] that conducted to [[Materialism]], ''Aristotle reproaches the Ionian philosophers in general with attempting to explain the evolution of the world without the Nous (intelligence); he regarded [[Protagoras]], who first introduced a spiritual principle, as a sober man among the inebriated.''

It was Plato, who made ''idea'' a technical term in philosophy, a world of abstract ideas [[idealism]]; Aristotle on the contrary, shows the real that dwells in the objects of sense; he thought that the natural world needed to be studied and observed for knowledge to be gained. His theory of act and potentiality, of form and ''matter'', is a new solution of the relations between the permanent and the changing; following the first attempts of the [[Presocratic Philosophy]] that conducted to [[Materialism]], ''Aristotle reproaches the Ionian philosophers in general with attempting to explain the evolution of the world without the Nous (intelligence); he regarded [[Protagoras]], who first introduced a spiritual principle, as a sober man among the inebriated.''

<ref> [http://www.newadvent.org/cathen/12025c.htm Philosophy] Catholic Encyclopedia. </ref>

<ref> [http://www.newadvent.org/cathen/12025c.htm Philosophy] Catholic Encyclopedia. </ref>

=== Medieval era ===

=== Medieval era ===