I have spoken more than once of the fruitful tension between Athens (philosophy) and Jerusalem (Biblical revelation). But there is also a tension, and it is also a fruitful one, within Athens. It is depicted, if such a thing can be depicted at all, in Raphael's School of Athens. Take a gander at the close-up below. Plato points up, Aristotle, the younger man, points down. The Forms are, in a manner of speaking, up yonder in a topos ouranos, in a heavenly place; his star pupil would, again in a manner of speaking, bring them down to earth. In a terminology I do not wholly endorse, Plato is an extreme, while Aristotle is a moderate, realist.
The vitality of the West is due, in part, to the fruitful tension between Athens and Jerusalem. And much of the vitality of philosophy derives from the fruitful tension between the Platonic and Aristotelian ways of thinking, not just as regards the problem of universals, but on a wide range of issues.