Aristotle (n.) described the forms of the syllogism so surely that nothing need be added — and then made no use of them in his properly philosophical inquiries.
Aristotle (n.) could not have produced or upheld a single one of his metaphysical concepts had it been subjected to the laws of the understanding he was first to expose.
Aristotle (n.) is not the founder of empiricism but the philosopher of the Idea at work: he scolded Plato's Idea for being mere dynamis and demanded it be energeia, inwardness totally to the fore.
Aristotle (n.) is the father of formal logic, the logic of the understanding, yet his grasp of speculative connections was so deep that his actual insights often ran ahead of his logical theory.
Aristotle (n.) penetrated into the whole universe of things, and subjected its scattered wealth to intelligence. It is to him that the greater number of the philosophical sciences owe their origin and distinction.